diff --git a/_inc/lib/class.color.php b/_inc/lib/class.color.php
index a57f2009c6a31..e145298c05d97 100644
--- a/_inc/lib/class.color.php
+++ b/_inc/lib/class.color.php
@@ -9,7 +9,7 @@
  *
  * @author Harold Asbridge <hasbridge@gmail.com>
  * @author Matt Wiebe <wiebe@automattic.com>
- * @license http://www.opensource.org/licenses/MIT
+ * @license https://www.opensource.org/licenses/MIT
  */
 
 class Jetpack_Color {
@@ -125,7 +125,7 @@ public function fromRgbHex($red, $green, $blue)
 
 	/**
 	 * Converts an HSL color value to RGB. Conversion formula
-	 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
+	 * adapted from https://en.wikipedia.org/wiki/HSL_color_space.
 	 * @param  int $h Hue. [0-360]
 	 * @param  in $s Saturation [0, 100]
 	 * @param  int $l Lightness [0, 100]
@@ -321,13 +321,13 @@ public function toHsvInt()
 	}
 
 	/**
- * Converts an RGB color value to HSL. Conversion formula
- * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
- * Assumes r, g, and b are contained in the set [0, 255] and
- * returns h in [0, 360], s in [0, 100], l in [0, 100]
- *
- * @return  Array		   The HSL representation
- */
+	 * Converts an RGB color value to HSL. Conversion formula
+	 * adapted from https://en.wikipedia.org/wiki/HSL_color_space.
+	 * Assumes r, g, and b are contained in the set [0, 255] and
+	 * returns h in [0, 360], s in [0, 100], l in [0, 100]
+	 *
+	 * @return  Array		   The HSL representation
+	 */
 	public function toHsl() {
 		list( $r, $g, $b ) = array_values( $this->toRgbInt() );
 		$r /= 255; $g /= 255; $b /= 255;
diff --git a/_inc/lib/class.core-rest-api-endpoints.php b/_inc/lib/class.core-rest-api-endpoints.php
index 8a3845ab07133..009120a6a2449 100644
--- a/_inc/lib/class.core-rest-api-endpoints.php
+++ b/_inc/lib/class.core-rest-api-endpoints.php
@@ -1629,7 +1629,7 @@ public static function get_updateable_data_list( $selector = '' ) {
 				'jp_group'          => 'carousel',
 			),
 			'carousel_display_exif' => array(
-				'description'       => wp_kses( sprintf( __( 'Show photo metadata (<a href="http://en.wikipedia.org/wiki/Exchangeable_image_file_format" target="_blank">Exif</a>) in carousel, when available.', 'jetpack' ) ), array( 'a' => array( 'href' => true, 'target' => true ) ) ),
+				'description'       => wp_kses( sprintf( __( 'Show photo metadata (<a href="https://en.wikipedia.org/wiki/Exchangeable_image_file_format" target="_blank">Exif</a>) in carousel, when available.', 'jetpack' ) ), array( 'a' => array( 'href' => true, 'target' => true ) ) ),
 				'type'              => 'boolean',
 				'default'           => 0,
 				'validate_callback' => __CLASS__ . '::validate_boolean',
diff --git a/_inc/lib/class.jetpack-password-checker.php b/_inc/lib/class.jetpack-password-checker.php
index 14de6053759f9..01b9c61c7d7a6 100644
--- a/_inc/lib/class.jetpack-password-checker.php
+++ b/_inc/lib/class.jetpack-password-checker.php
@@ -518,7 +518,7 @@ protected function get_char_index( $char ) {
 	 * L = String length (the for iterator)
 	 * N = Our charset size, via get_charset_size()
 	 *
-	 * @see http://en.wikipedia.org/wiki/Password_strength#Random_passwords
+	 * @see https://en.wikipedia.org/wiki/Password_strength#Random_passwords
 	 *
 	 * On top of the base formula, we're also multiplying the bits of entropy for every char
 	 * by 1 - (the probabily of it following the previous char)
diff --git a/_inc/lib/debugger/class-jetpack-debugger.php b/_inc/lib/debugger/class-jetpack-debugger.php
index 485bcc1cd2d06..4e42e30bb58e8 100644
--- a/_inc/lib/debugger/class-jetpack-debugger.php
+++ b/_inc/lib/debugger/class-jetpack-debugger.php
@@ -144,9 +144,9 @@ public static function jetpack_debug_display_handler() {
 									),
 								)
 							),
-							'http://jetpack.com/support/getting-started-with-jetpack/known-issues/',
-							'http://jetpack.com/support/getting-started-with-jetpack/known-issues/',
-							'http://jetpack.com/support/',
+							'https://jetpack.com/support/getting-started-with-jetpack/known-issues/',
+							'https://jetpack.com/support/getting-started-with-jetpack/known-issues/',
+							'https://jetpack.com/support/',
 							'https://wordpress.org/support/plugin/jetpack'
 						);
 						?>
diff --git a/_inc/lib/icalendar-reader.php b/_inc/lib/icalendar-reader.php
index f7e047f9812cc..306f9fffcaef6 100644
--- a/_inc/lib/icalendar-reader.php
+++ b/_inc/lib/icalendar-reader.php
@@ -895,7 +895,7 @@ protected function sort_by_recent( $list ) {
  * @return array
  */
 function icalendar_get_events( $url = '', $count = 5 ) {
-	// Find your calendar's address http://support.google.com/calendar/bin/answer.py?hl=en&answer=37103
+	// Find your calendar's address https://support.google.com/calendar/bin/answer.py?hl=en&answer=37103
 	$ical = new iCalendarReader();
 	return $ical->get_events( $url, $count );
 }
diff --git a/_inc/lib/tonesque.php b/_inc/lib/tonesque.php
index 17158e3d2b6c1..511c838f6cdc4 100644
--- a/_inc/lib/tonesque.php
+++ b/_inc/lib/tonesque.php
@@ -1,13 +1,13 @@
 <?php
 /*
 Plugin Name: Tonesque
-Plugin URI: http://automattic.com/
+Plugin URI: https://automattic.com/
 Description: Grab an average color representation from an image.
 Version: 1.0
 Author: Automattic, Matias Ventura
-Author URI: http://automattic.com/
+Author URI: https://automattic.com/
 License: GNU General Public License v2 or later
-License URI: http://www.gnu.org/licenses/gpl-2.0.html
+License URI: https://www.gnu.org/licenses/gpl-2.0.html
 */
 
 class Tonesque {
diff --git a/class.json-api.php b/class.json-api.php
index e308ed3167a6b..cb009ebfb84f8 100644
--- a/class.json-api.php
+++ b/class.json-api.php
@@ -419,7 +419,7 @@ function output( $status_code, $response = null, $content_type = 'application/js
 		if ( $callback ) {
 			// Mitigate Rosetta Flash [1] by setting the Content-Type-Options: nosniff header
 			// and by prepending the JSONP response with a JS comment.
-			// [1] http://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/
+			// [1] https://blog.miki.it/2014/7/8/abusing-jsonp-with-rosetta-flash/index.html
 			echo "/**/$callback(";
 
 		}
@@ -742,7 +742,7 @@ function wp_die_handler( $message, $title = '', $args = array() ) {
 			'response' => $this->trapped_error['status'],
 		) );
 
-		// ... unless it's 500 ( see http://wp.me/pMz3w-5VV )
+		// ... unless it's 500
 		if ( (int) $args['response'] !== 500 ) {
 			$this->trapped_error['status'] = $args['response'];
 		}
diff --git a/class.photon.php b/class.photon.php
index 6e351e3005dce..2900994595683 100644
--- a/class.photon.php
+++ b/class.photon.php
@@ -9,7 +9,7 @@ class Jetpack_Photon {
 	// Oh look, a singleton
 	private static $__instance = null;
 
-	// Allowed extensions must match http://code.trac.wordpress.org/browser/photon/index.php#L31
+	// Allowed extensions must match https://code.trac.wordpress.org/browser/photon/index.php#L31
 	protected static $extensions = array(
 		'gif',
 		'jpg',
diff --git a/functions.compat.php b/functions.compat.php
index 4e1f47af4a145..691208586862a 100644
--- a/functions.compat.php
+++ b/functions.compat.php
@@ -56,7 +56,7 @@ function youtube_sanitize_url( $url ) {
 	$url = trim( $url );
 	$url = str_replace( array( 'youtu.be/', '/v/', '#!v=', '&amp;', '&#038;', 'playlist' ), array( 'youtu.be/?v=', '/?v=', '?v=', '&', '&', 'videoseries' ), $url );
 
-	// Replace any extra question marks with ampersands - the result of a URL like "http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US" being passed in.
+	// Replace any extra question marks with ampersands - the result of a URL like "https://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US" being passed in.
 	$query_string_start = strpos( $url, "?" );
 
 	if ( false !== $query_string_start ) {
diff --git a/functions.opengraph.php b/functions.opengraph.php
index 04a776696fc57..cc60770f4fa43 100644
--- a/functions.opengraph.php
+++ b/functions.opengraph.php
@@ -5,8 +5,8 @@
  * Add Open Graph tags so that Facebook (and any other service that supports them)
  * can crawl the site better and we provide a better sharing experience.
  *
- * @link http://ogp.me/
- * @link http://developers.facebook.com/docs/opengraph/
+ * @link https://ogp.me/
+ * @link https://developers.facebook.com/docs/opengraph/
  *
  * @package Jetpack
  */
@@ -95,8 +95,8 @@ function jetpack_og_tags() {
 			$tags['profile:last_name']  = get_the_author_meta( 'last_name', $author->ID );
 		}
 	} elseif ( is_archive() ) {
-		$tags['og:type']      = 'website';
-		$tags['og:title']     = wp_get_document_title();
+		$tags['og:type']  = 'website';
+		$tags['og:title'] = wp_get_document_title();
 
 		$archive = get_queried_object();
 		if ( ! empty( $archive ) ) {
diff --git a/functions.photon.php b/functions.photon.php
index f3e03fe243073..3c7c2f86f3792 100644
--- a/functions.photon.php
+++ b/functions.photon.php
@@ -3,7 +3,7 @@
 /**
  * Generates a Photon URL.
  *
- * @see http://developer.wordpress.com/docs/photon/
+ * @see https://developer.wordpress.com/docs/photon/
  *
  * @param string $image_url URL to the publicly accessible image you want to manipulate
  * @param array|string $args An array of arguments, i.e. array( 'w' => '300', 'resize' => array( 123, 456 ) ), or in string form (w=123&h=456)
@@ -88,7 +88,7 @@ function jetpack_photon_url( $image_url, $args = array(), $scheme = null ) {
 		}
 
 		// Encode values
-		// See http://core.trac.wordpress.org/ticket/17923
+		// See https://core.trac.wordpress.org/ticket/17923
 		$args = rawurlencode_deep( $args );
 	}
 
@@ -273,7 +273,7 @@ function jetpack_photon_url_scheme( $url, $scheme ) {
  * A wrapper for PHP's parse_url, prepending assumed scheme for network path
  * URLs. PHP versions 5.4.6 and earlier do not correctly parse without scheme.
  *
- * @see http://php.net/manual/en/function.parse-url.php#refsect1-function.parse-url-changelog
+ * @see https://php.net/manual/en/function.parse-url.php#refsect1-function.parse-url-changelog
  *
  * @param string $url The URL to parse
  * @param integer $component Retrieve specific URL component
diff --git a/json-endpoints/class.wpcom-json-api-update-post-endpoint.php b/json-endpoints/class.wpcom-json-api-update-post-endpoint.php
index 80dccac64f66b..43d6fe11ea84d 100644
--- a/json-endpoints/class.wpcom-json-api-update-post-endpoint.php
+++ b/json-endpoints/class.wpcom-json-api-update-post-endpoint.php
@@ -484,7 +484,7 @@ function write_post( $path, $blog_id, $post_id ) {
 			$insert['ID'] = $post->ID;
 
 			// wp_update_post ignores date unless edit_date is set
-			// See: http://codex.wordpress.org/Function_Reference/wp_update_post#Scheduling_posts
+			// See: https://codex.wordpress.org/Function_Reference/wp_update_post#Scheduling_posts
 			// See: https://core.trac.wordpress.org/browser/tags/3.9.2/src/wp-includes/post.php#L3302
 			if ( isset( $input['date_gmt'] ) || isset( $input['date'] ) ) {
 				$insert['edit_date'] = true;
diff --git a/json-endpoints/class.wpcom-json-api-update-post-v1-1-endpoint.php b/json-endpoints/class.wpcom-json-api-update-post-v1-1-endpoint.php
index 3778f16dc74f4..b3d9b98d69af2 100644
--- a/json-endpoints/class.wpcom-json-api-update-post-v1-1-endpoint.php
+++ b/json-endpoints/class.wpcom-json-api-update-post-v1-1-endpoint.php
@@ -559,7 +559,7 @@ function write_post( $path, $blog_id, $post_id ) {
 			$insert['ID'] = $post->ID;
 
 			// wp_update_post ignores date unless edit_date is set
-			// See: http://codex.wordpress.org/Function_Reference/wp_update_post#Scheduling_posts
+			// See: https://codex.wordpress.org/Function_Reference/wp_update_post#Scheduling_posts
 			// See: https://core.trac.wordpress.org/browser/tags/3.9.2/src/wp-includes/post.php#L3302
 			if ( isset( $input['date_gmt'] ) || isset( $input['date'] ) ) {
 				$insert['edit_date'] = true;
diff --git a/json-endpoints/class.wpcom-json-api-update-post-v1-2-endpoint.php b/json-endpoints/class.wpcom-json-api-update-post-v1-2-endpoint.php
index 113766a13553e..f0f2d0446fa15 100644
--- a/json-endpoints/class.wpcom-json-api-update-post-v1-2-endpoint.php
+++ b/json-endpoints/class.wpcom-json-api-update-post-v1-2-endpoint.php
@@ -530,7 +530,7 @@ function write_post( $path, $blog_id, $post_id ) {
 			$insert['ID'] = $post->ID;
 
 			// wp_update_post ignores date unless edit_date is set
-			// See: http://codex.wordpress.org/Function_Reference/wp_update_post#Scheduling_posts
+			// See: https://codex.wordpress.org/Function_Reference/wp_update_post#Scheduling_posts
 			// See: https://core.trac.wordpress.org/browser/tags/3.9.2/src/wp-includes/post.php#L3302
 			if ( isset( $input['date_gmt'] ) || isset( $input['date'] ) ) {
 				$insert['edit_date'] = true;
diff --git a/load-jetpack.php b/load-jetpack.php
index 4a8bb9cd8204c..9242509f511a5 100644
--- a/load-jetpack.php
+++ b/load-jetpack.php
@@ -72,7 +72,7 @@ function jetpack_should_use_minified_assets() {
 	jetpack_require_lib( 'debugger' );
 }
 
-// Play nice with http://wp-cli.org/.
+// Play nice with https://wp-cli.org/.
 if ( defined( 'WP_CLI' ) && WP_CLI ) {
 	require_once JETPACK__PLUGIN_DIR . 'class.jetpack-cli.php';
 }
@@ -89,7 +89,7 @@ function jetpack_should_use_minified_assets() {
 /**
  * Add an easy way to photon-ize a URL that is safe to call even if Jetpack isn't active.
  *
- * See: http://jetpack.com/2013/07/11/photon-and-themes/
+ * See: https://jetpack.com/2013/07/11/photon-and-themes/
  */
 if ( Jetpack::is_module_active( 'photon' ) ) {
 	add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 );
diff --git a/modules/carousel/jetpack-carousel.php b/modules/carousel/jetpack-carousel.php
index 207e880ad18dc..0bce42d91d4f3 100644
--- a/modules/carousel/jetpack-carousel.php
+++ b/modules/carousel/jetpack-carousel.php
@@ -792,7 +792,7 @@ function settings_select( $name, $values, $extra_text = '' ) {
 	}
 
 	function carousel_display_exif_callback() {
-		$this->settings_checkbox( 'carousel_display_exif', __( 'Show photo metadata (<a href="http://en.wikipedia.org/wiki/Exchangeable_image_file_format" rel="noopener noreferrer" target="_blank">Exif</a>) in carousel, when available.', 'jetpack' ) );
+		$this->settings_checkbox( 'carousel_display_exif', __( 'Show photo metadata (<a href="https://en.wikipedia.org/wiki/Exchangeable_image_file_format" rel="noopener noreferrer" target="_blank">Exif</a>) in carousel, when available.', 'jetpack' ) );
 	}
 
 	function carousel_display_exif_sanitize( $value ) {
diff --git a/modules/comments/comments.php b/modules/comments/comments.php
index bf1e4e874320e..3d8023fde47ab 100644
--- a/modules/comments/comments.php
+++ b/modules/comments/comments.php
@@ -302,7 +302,7 @@ public function comment_form_after() {
 		}
 
 		$params['sig']    = $signature;
-		$url_origin       = set_url_scheme( 'http://jetpack.wordpress.com' );
+		$url_origin       = 'https://jetpack.wordpress.com';
 		$url              = "{$url_origin}/jetpack-comment/?" . http_build_query( $params );
 		$url              = "{$url}#parent=" . urlencode( set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] ) );
 		$this->signed_url = $url;
@@ -364,7 +364,7 @@ public function comment_form_after() {
 	 * @since JetpackComments (1.4)
 	 */
 	public function watch_comment_parent() {
-		$url_origin = set_url_scheme( 'http://jetpack.wordpress.com' );
+		$url_origin = 'https://jetpack.wordpress.com';
 		?>
 
 		<!--[if IE]>
diff --git a/modules/contact-form/admin.php b/modules/contact-form/admin.php
index 8b6a03c0ad80e..c8c7d05334472 100644
--- a/modules/contact-form/admin.php
+++ b/modules/contact-form/admin.php
@@ -89,7 +89,7 @@ function grunion_admin_css() {
  * Hack a 'Bulk Delete' option for bulk edit in spam view
  *
  * There isn't a better way to do this until
- * http://core.trac.wordpress.org/changeset/17297 is resolved
+ * https://core.trac.wordpress.org/changeset/17297 is resolved
  */
 add_action( 'admin_head', 'grunion_add_bulk_edit_option' );
 function grunion_add_bulk_edit_option() {
diff --git a/modules/contact-form/grunion-contact-form.php b/modules/contact-form/grunion-contact-form.php
index db80aed351588..726452c8df6a7 100644
--- a/modules/contact-form/grunion-contact-form.php
+++ b/modules/contact-form/grunion-contact-form.php
@@ -5,9 +5,9 @@
 /*
 Plugin Name: Grunion Contact Form
 Description: Add a contact form to any post, page or text widget.  Emails will be sent to the post's author by default, or any email address you choose.  As seen on WordPress.com.
-Plugin URI: http://automattic.com/#
+Plugin URI: https://automattic.com/#
 AUthor: Automattic, Inc.
-Author URI: http://automattic.com/
+Author URI: https://automattic.com/
 Version: 2.4
 License: GPLv2 or later
 */
@@ -1406,7 +1406,7 @@ function download_feedback_as_csv() {
 	 *
 	 * Additionally, Excel exposes the ability to launch arbitrary commands through the DDE protocol.
 	 *
-	 * @see http://www.contextis.com/resources/blog/comma-separated-vulnerabilities/
+	 * @see https://www.contextis.com/en/blog/comma-separated-vulnerabilities
 	 *
 	 * @param string $field
 	 *
diff --git a/modules/contact-form/grunion-editor-view.php b/modules/contact-form/grunion-editor-view.php
index 1b83f18537467..b8ff5c0c66ad0 100644
--- a/modules/contact-form/grunion-editor-view.php
+++ b/modules/contact-form/grunion-editor-view.php
@@ -5,7 +5,7 @@
 /*
  * A prototype to allow inline editing / editor views for contact forms.\
  *
- * Originally developed in: http://github.com/automattic/gm2016-grunion-editor
+ * Originally developed in: https://github.com/automattic/gm2016-grunion-editor
  * Authors: Michael Arestad, Andrew Ozz, and George Stephanis
  */
 
diff --git a/modules/custom-content-types.php b/modules/custom-content-types.php
index 5976bfc190270..e213e258904ec 100644
--- a/modules/custom-content-types.php
+++ b/modules/custom-content-types.php
@@ -39,7 +39,7 @@ function jetpack_cpt_section_callback() {
 	?>
 	<p>
 		<?php esc_html_e( 'Use these settings to display different types of content on your site.', 'jetpack' ); ?>
-		<a target="_blank" href="http://jetpack.com/support/custom-content-types/"><?php esc_html_e( 'Learn More', 'jetpack' ); ?></a>
+		<a target="_blank" href="https://jetpack.com/support/custom-content-types/"><?php esc_html_e( 'Learn More', 'jetpack' ); ?></a>
 	</p>
 	<?php
 }
diff --git a/modules/custom-css/csstidy/class.csstidy.php b/modules/custom-css/csstidy/class.csstidy.php
index e92669dafcfff..40eb3e5188619 100644
--- a/modules/custom-css/csstidy/class.csstidy.php
+++ b/modules/custom-css/csstidy/class.csstidy.php
@@ -19,9 +19,9 @@
  *   GNU Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public License
- *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
- * @license http://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
+ * @license https://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
  * @package csstidy
  * @author Florian Schmitz (floele at gmail dot com) 2005-2007
  * @author Brett Zamir (brettz9 at yahoo dot com) 2007
@@ -64,7 +64,7 @@
  * In opposite to most other CSS parsers, it does not use regular expressions and
  * thus has full CSS2 support and a higher reliability.
  * Additional to that it applies some optimisations and fixes to the CSS code.
- * An online version should be available here: http://cdburnerxp.se/cssparse/css_optimiser.php
+ * An online version should be available here: https://cdburnerxp.se/cssparse/css_optimiser.php
  * @package csstidy
  * @author Florian Schmitz (floele at gmail dot com) 2005-2006
  * @version 1.3.1
diff --git a/modules/custom-css/csstidy/class.csstidy_ctype.php b/modules/custom-css/csstidy/class.csstidy_ctype.php
index bc5accc508fb8..37e87f7d4f26c 100644
--- a/modules/custom-css/csstidy/class.csstidy_ctype.php
+++ b/modules/custom-css/csstidy/class.csstidy_ctype.php
@@ -22,7 +22,7 @@
  * along with CSSTidy; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
- * @license http://opensource.org/licenses/gpl-license.php GNU Public License
+ * @license https://opensource.org/licenses/gpl-license.php GNU Public License
  * @package csstidy
  * @author Nikolay Matsievsky (speed at webo dot name) 2009-2010
  * @version 1.0
@@ -43,4 +43,4 @@ function ctype_alpha($text) {
 	}
 
 }
-?>
\ No newline at end of file
+?>
diff --git a/modules/custom-css/csstidy/class.csstidy_optimise.php b/modules/custom-css/csstidy/class.csstidy_optimise.php
index 176e0fd3f67f9..e42ac06f31667 100644
--- a/modules/custom-css/csstidy/class.csstidy_optimise.php
+++ b/modules/custom-css/csstidy/class.csstidy_optimise.php
@@ -21,9 +21,9 @@
  *   GNU Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public License
- *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
- * @license http://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
+ * @license https://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
  * @package csstidy
  * @author Florian Schmitz (floele at gmail dot com) 2005-2007
  * @author Brett Zamir (brettz9 at yahoo dot com) 2007
diff --git a/modules/custom-css/csstidy/class.csstidy_print.php b/modules/custom-css/csstidy/class.csstidy_print.php
index 56b954040d58e..0e225e87729dd 100644
--- a/modules/custom-css/csstidy/class.csstidy_print.php
+++ b/modules/custom-css/csstidy/class.csstidy_print.php
@@ -20,9 +20,9 @@
  *   GNU Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public License
- *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
- * @license http://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
+ * @license https://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
  * @package csstidy
  * @author Florian Schmitz (floele at gmail dot com) 2005-2007
  * @author Brett Zamir (brettz9 at yahoo dot com) 2007
diff --git a/modules/custom-css/csstidy/data.inc.php b/modules/custom-css/csstidy/data.inc.php
index 9ed2e1c44ea2f..0cf8f9a31d15b 100644
--- a/modules/custom-css/csstidy/data.inc.php
+++ b/modules/custom-css/csstidy/data.inc.php
@@ -18,7 +18,7 @@
  * along with CSSTidy; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
- * @license http://opensource.org/licenses/gpl-license.php GNU Public License
+ * @license https://opensource.org/licenses/gpl-license.php GNU Public License
  * @package csstidy
  * @author Florian Schmitz (floele at gmail dot com) 2005
  * @author Nikolay Matsievsky (speed at webo dot name) 2010
diff --git a/modules/custom-css/csstidy/lang.inc.php b/modules/custom-css/csstidy/lang.inc.php
index d4c61114d8941..0a3ad0140cc7a 100644
--- a/modules/custom-css/csstidy/lang.inc.php
+++ b/modules/custom-css/csstidy/lang.inc.php
@@ -18,9 +18,9 @@
  *   GNU Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public License
- *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
- * @license http://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
+ * @license https://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
  * @package csstidy
  * @author Florian Schmitz (floele at gmail dot com) 2005-2007
   * @author Brett Zamir (brettz9 at yahoo dot com) 2007
@@ -45,7 +45,7 @@
 $lang['en'][2] = '(based on';
 $lang['en'][3] = '(plaintext)';
 $lang['en'][4] = 'Important Note:';
-$lang['en'][6] = 'Your code should be well-formed. This is <strong>not a validator</strong> which points out errors in your CSS code. To make sure that your code is valid, use the <a href="http://jigsaw.w3.org/css-validator/">W3C Validator</a>.';
+$lang['en'][6] = 'Your code should be well-formed. This is <strong>not a validator</strong> which points out errors in your CSS code. To make sure that your code is valid, use the <a href="https://jigsaw.w3.org/css-validator/">W3C Validator</a>.';
 $lang['en'][7] = 'all comments are removed';
 $lang['en'][8] = 'CSS Input:';
 $lang['en'][9] = 'CSS-Code:';
@@ -112,7 +112,7 @@
 $lang['de'][2] = '(basierend auf';
 $lang['de'][3] = '(Textversion)';
 $lang['de'][4] = 'Wichtiger Hinweis:';
-$lang['de'][6] = 'Der CSS Code sollte wohlgeformt sein. Der CSS Code wird <strong>nicht auf Gültigkeit überprüft</strong>. Um sicherzugehen dass dein Code valide ist, benutze den <a href="http://jigsaw.w3.org/css-validator/">W3C Validierungsservice</a>.';
+$lang['de'][6] = 'Der CSS Code sollte wohlgeformt sein. Der CSS Code wird <strong>nicht auf Gültigkeit überprüft</strong>. Um sicherzugehen dass dein Code valide ist, benutze den <a href="https://jigsaw.w3.org/css-validator/">W3C Validierungsservice</a>.';
 $lang['de'][7] = 'alle Kommentare werden entfernt';
 $lang['de'][8] = 'CSS Eingabe:';
 $lang['de'][9] = 'CSS-Code:';
@@ -179,7 +179,7 @@
 $lang['fr'][2] = '(basé sur ';
 $lang['fr'][3] = '(Version texte)';
 $lang['fr'][4] = 'Note Importante&#160;:';
-$lang['fr'][6] = 'Votre code doit être valide. Ce n’est <strong>pas un validateur</strong> qui signale les erreurs dans votre code CSS. Pour être sûr que votre code est correct, utilisez le validateur&#160;: <a href="http://jigsaw.w3.org/css-validator/">W3C Validator</a>.';
+$lang['fr'][6] = 'Votre code doit être valide. Ce n’est <strong>pas un validateur</strong> qui signale les erreurs dans votre code CSS. Pour être sûr que votre code est correct, utilisez le validateur&#160;: <a href="https://jigsaw.w3.org/css-validator/">W3C Validator</a>.';
 $lang['fr'][7] = 'tous les commentaires sont enlevés';
 $lang['fr'][8] = 'Champ CSS&#160;:';
 $lang['fr'][9] = 'Code CSS&#160;:';
@@ -246,7 +246,7 @@
 $lang['zh'][2] = '(使用';
 $lang['zh'][3] = '(純文字)';
 $lang['zh'][4] = '重要事項:';
-$lang['zh'][6] = '你的原始碼必須是良構的(well-formed). 這個工具<strong>沒有內建驗證器(validator)</strong>. 驗證器能夠指出你CSS原始碼裡的錯誤. 請使用 <a href="http://jigsaw.w3.org/css-validator/">W3C 驗證器</a>, 確保你的原始碼合乎規範.';
+$lang['zh'][6] = '你的原始碼必須是良構的(well-formed). 這個工具<strong>沒有內建驗證器(validator)</strong>. 驗證器能夠指出你CSS原始碼裡的錯誤. 請使用 <a href="https://jigsaw.w3.org/css-validator/">W3C 驗證器</a>, 確保你的原始碼合乎規範.';
 $lang['zh'][7] = '所有註解都移除了';
 $lang['zh'][8] = 'CSS 輸入:';
 $lang['zh'][9] = 'CSS 原始碼:';
diff --git a/modules/custom-css/custom-css.php b/modules/custom-css/custom-css.php
index 622076bcdb8e8..068b1f0bacb49 100644
--- a/modules/custom-css/custom-css.php
+++ b/modules/custom-css/custom-css.php
@@ -26,7 +26,7 @@ static function init() {
 			! Jetpack_User_Agent_Info::is_ipad() &&
 			/**
 			 * Should the Custom CSS module use ACE to process CSS.
-			 * @see http://ace.c9.io/
+			 * @see https://ace.c9.io/
 			 *
 			 * @module custom-css
 			 *
@@ -634,7 +634,7 @@ static function get_css( $compressed = false ) {
 					apply_filters(
 						'safecss_default_css',
 						__(
-							"Welcome to Custom CSS!\n\nTo learn how this works, see http://wp.me/PEmnE-Bt",
+							"Welcome to Custom CSS!\n\nTo learn how this works, see https://wp.me/PEmnE-Bt",
 							'jetpack'
 						)
 					)
@@ -1006,7 +1006,7 @@ static function admin() {
 						 *
 						 * @param string $str Intro text appearing above the Custom CSS editor.
 						 */
-						echo apply_filters( 'safecss_intro_text', __( 'New to CSS? Start with a <a href="http://www.htmldog.com/guides/cssbeginner/" rel="noopener noreferrer" target="_blank">beginner tutorial</a>. Questions?
+						echo apply_filters( 'safecss_intro_text', __( 'New to CSS? Start with a <a href="https://www.htmldog.com/guides/css/beginner/" rel="noopener noreferrer" target="_blank">beginner tutorial</a>. Questions?
 		Ask in the <a href="https://wordpress.org/support/forum/themes-and-templates" rel="noopener noreferrer" target="_blank">Themes and Templates forum</a>.', 'jetpack' ) );
 					?></p>
 					<p class="css-support"><?php echo __( 'Note: Custom CSS will be reset when changing themes.', 'jetpack' ); ?></p>
@@ -1066,7 +1066,7 @@ static function content_width_settings() {
 						 *
 						 * @param string $url Custom CSS limited width's support doc URL.
 						 */
-						apply_filters( 'safecss_limit_width_link', 'http://jetpack.com/support/custom-css/#limited-width' )
+						apply_filters( 'safecss_limit_width_link', 'https://jetpack.com/support/custom-css/#limited-width' )
 					);
 
 					?>
diff --git a/modules/custom-css/custom-css/preprocessors/lessc.inc.php b/modules/custom-css/custom-css/preprocessors/lessc.inc.php
index ddaa47881426f..e4e4973bd37aa 100644
--- a/modules/custom-css/custom-css/preprocessors/lessc.inc.php
+++ b/modules/custom-css/custom-css/preprocessors/lessc.inc.php
@@ -2,7 +2,7 @@
 
 /**
  * lessphp v0.5.0
- * http://leafo.net/lessphp
+ * https://leafo.net/lessphp
  *
  * LESS CSS compiler, adapted from http://lesscss.org
  *
@@ -1202,7 +1202,7 @@ protected function lib_percentage($arg) {
 
 	// mixes two colors by weight
 	// mix(@color1, @color2, [@weight: 50%]);
-	// http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
+	// https://sass-lang.com/documentation/functions/color#mix
 	protected function lib_mix($args) {
 		if ($args[0] != "list" || count($args[2]) < 2)
 			$this->throwError("mix expects (color1, color2, weight)");
@@ -2593,7 +2593,7 @@ protected function expressionList(&$exps) {
 
 	/**
 	 * Attempt to consume an expression.
-	 * @link http://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code
+	 * @link https://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code
 	 */
 	protected function expression(&$out) {
 		if ($this->value($lhs)) {
diff --git a/modules/custom-css/custom-css/preprocessors/scss.inc.php b/modules/custom-css/custom-css/preprocessors/scss.inc.php
index 344b55f1a047b..a59a653bf3ef1 100644
--- a/modules/custom-css/custom-css/preprocessors/scss.inc.php
+++ b/modules/custom-css/custom-css/preprocessors/scss.inc.php
@@ -4,10 +4,10 @@
  *
  * @copyright 2012-2013 Leaf Corcoran
  *
- * @license http://opensource.org/licenses/gpl-license GPL-3.0
- * @license http://opensource.org/licenses/MIT MIT
+ * @license https://opensource.org/licenses/gpl-license GPL-3.0
+ * @license https://opensource.org/licenses/MIT MIT
  *
- * @link http://leafo.net/scssphp
+ * @link https://leafo.net/scssphp
  */
 
 /**
@@ -2380,7 +2380,7 @@ public function throwError($msg = null) {
 	/**
 	 * CSS Colors
 	 *
-	 * @see http://www.w3.org/TR/css3-color
+	 * @see https://www.w3.org/TR/css-color-3/
 	 */
 	static protected $cssColors = array(
 		'aliceblue' => '240,248,255',
diff --git a/modules/custom-post-types/comics.php b/modules/custom-post-types/comics.php
index 91647e80993d0..c67b1d97455b9 100644
--- a/modules/custom-post-types/comics.php
+++ b/modules/custom-post-types/comics.php
@@ -280,7 +280,7 @@ public function manage_posts_custom_column( $column_name, $post_ID ) {
 	 * for Feedbag (the Reader's feed storage mechanism), eschew
 	 * a pretty URL for one that will get the post into the Reader.
 	 *
-	 * @see http://core.trac.wordpress.org/ticket/19744
+	 * @see https://core.trac.wordpress.org/ticket/19744
 	 * @param string $permalink The existing (possibly pretty) permalink.
 	 */
 	public function custom_permalink_for_feedbag( $permalink ) {
@@ -311,7 +311,7 @@ function updated_messages( $messages ) {
 			7  => esc_html__( 'Comic saved.', 'jetpack' ),
 			8  => sprintf( __( 'Comic submitted. <a target="_blank" href="%s">Preview comic</a>', 'jetpack'), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
 			9  => sprintf( __( 'Comic scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview comic</a>', 'jetpack' ),
-			// translators: Publish box date format, see http://php.net/date
+			// translators: Publish box date format, see https://php.net/date
 			date_i18n( __( 'M j, Y @ G:i', 'jetpack' ), strtotime( $post->post_date ) ), esc_url( get_permalink($post->ID) ) ),
 			10 => sprintf( __( 'Comic draft updated. <a target="_blank" href="%s">Preview comic</a>', 'jetpack' ), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
 		);
@@ -521,7 +521,7 @@ function comics_welcome_email( $welcome_email, $blog_id, $user_id, $password, $t
 
 Your webcomic's new site is ready to go. Get started by <a href=\"BLOG_URLwp-admin/customize.php#title\">setting your comic's title and tagline</a> so your readers know what it's all about.
 
-Looking for more help with setting up your site? Check out the WordPress.com <a href=\"http://learn.wordpress.com/\" target=\"_blank\">beginner's tutorial</a> and the <a href=\"http://en.support.wordpress.com/comics/\" target=\"_blank\">guide to comics on WordPress.com</a>. Dive right in by <a href=\"BLOG_URLwp-admin/customize.php#title\">publishing your first strip!</a>
+Looking for more help with setting up your site? Check out the WordPress.com <a href=\"https://learn.wordpress.com/\" target=\"_blank\">beginner's tutorial</a> and the <a href=\"https://en.support.wordpress.com/comics/\" target=\"_blank\">guide to comics on WordPress.com</a>. Dive right in by <a href=\"BLOG_URLwp-admin/customize.php#title\">publishing your first strip!</a>
 
 Lots of laughs,
 The WordPress.com Team", 'jetpack' );
diff --git a/modules/custom-post-types/nova.php b/modules/custom-post-types/nova.php
index cc3ab922837b1..b4cf0281f4596 100644
--- a/modules/custom-post-types/nova.php
+++ b/modules/custom-post-types/nova.php
@@ -280,7 +280,7 @@ function updated_messages( $messages ) {
 			8  => sprintf( __( 'Menu item submitted. <a target="_blank" href="%s">Preview item</a>', 'jetpack' ), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
 			/* translators: this is about a food menu */
 			9  => sprintf( __( 'Menu item scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview item</a>', 'jetpack' ),
-			// translators: Publish box date format, see http://php.net/date
+			// translators: Publish box date format, see https://php.net/date
 			date_i18n( __( 'M j, Y @ G:i', 'jetpack' ), strtotime( $post->post_date ) ), esc_url( get_permalink($post->ID) ) ),
 			/* translators: this is about a food menu */
 			10 => sprintf( __( 'Menu item draft updated. <a target="_blank" href="%s">Preview item</a>', 'jetpack' ), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
diff --git a/modules/custom-post-types/portfolios.php b/modules/custom-post-types/portfolios.php
index dd3858ee672f5..e41728fcfcf82 100644
--- a/modules/custom-post-types/portfolios.php
+++ b/modules/custom-post-types/portfolios.php
@@ -137,7 +137,7 @@ function setting_html() {
 			<label for="<?php echo esc_attr( self::OPTION_NAME ); ?>">
 				<input name="<?php echo esc_attr( self::OPTION_NAME ); ?>" id="<?php echo esc_attr( self::OPTION_NAME ); ?>" <?php echo checked( get_option( self::OPTION_NAME, '0' ), true, false ); ?> type="checkbox" value="1" />
 				<?php esc_html_e( 'Enable Portfolio Projects for this site.', 'jetpack' ); ?>
-				<a target="_blank" href="http://en.support.wordpress.com/portfolios/"><?php esc_html_e( 'Learn More', 'jetpack' ); ?></a>
+				<a target="_blank" href="https://en.support.wordpress.com/portfolios/"><?php esc_html_e( 'Learn More', 'jetpack' ); ?></a>
 			</label>
 		<?php endif;
 		if ( get_option( self::OPTION_NAME, '0' ) || current_theme_supports( self::CUSTOM_POST_TYPE ) ) :
@@ -383,7 +383,7 @@ function updated_messages( $messages ) {
 			7  => esc_html__( 'Project saved.', 'jetpack' ),
 			8  => sprintf( __( 'Project submitted. <a target="_blank" href="%s">Preview project</a>', 'jetpack'), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
 			9  => sprintf( __( 'Project scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview project</a>', 'jetpack' ),
-			// translators: Publish box date format, see http://php.net/date
+			// translators: Publish box date format, see https://php.net/date
 			date_i18n( __( 'M j, Y @ G:i', 'jetpack' ), strtotime( $post->post_date ) ), esc_url( get_permalink( $post->ID ) ) ),
 			10 => sprintf( __( 'Project item draft updated. <a target="_blank" href="%s">Preview project</a>', 'jetpack' ), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
 		);
diff --git a/modules/custom-post-types/testimonial.php b/modules/custom-post-types/testimonial.php
index ba427244128a3..30b44a25e2b77 100644
--- a/modules/custom-post-types/testimonial.php
+++ b/modules/custom-post-types/testimonial.php
@@ -152,7 +152,7 @@ function setting_html() {
 			<label for="<?php echo esc_attr( self::OPTION_NAME ); ?>">
 				<input name="<?php echo esc_attr( self::OPTION_NAME ); ?>" id="<?php echo esc_attr( self::OPTION_NAME ); ?>" <?php echo checked( get_option( self::OPTION_NAME, '0' ), true, false ); ?> type="checkbox" value="1" />
 				<?php esc_html_e( 'Enable Testimonials for this site.', 'jetpack' ); ?>
-				<a target="_blank" href="http://en.support.wordpress.com/testimonials/"><?php esc_html_e( 'Learn More', 'jetpack' ); ?></a>
+				<a target="_blank" href="https://en.support.wordpress.com/testimonials/"><?php esc_html_e( 'Learn More', 'jetpack' ); ?></a>
 			</label>
 		<?php endif;
 
@@ -352,7 +352,7 @@ function updated_messages( $messages ) {
 			7  => esc_html__( 'Testimonial saved.', 'jetpack' ),
 			8  => sprintf( __( 'Testimonial submitted. <a target="_blank" href="%s">Preview testimonial</a>', 'jetpack'), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
 			9  => sprintf( __( 'Testimonial scheduled for: <strong>%1$s</strong>. <a target="_blank" href="%2$s">Preview testimonial</a>', 'jetpack' ),
-				// translators: Publish box date format, see http://php.net/date
+				// translators: Publish box date format, see https://php.net/date
 				date_i18n( __( 'M j, Y @ G:i', 'jetpack' ), strtotime( $post->post_date ) ), esc_url( get_permalink($post->ID) ) ),
 			10 => sprintf( __( 'Testimonial draft updated. <a target="_blank" href="%s">Preview testimonial</a>', 'jetpack' ), esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ),
 		);
diff --git a/modules/google-analytics/wp-google-analytics.php b/modules/google-analytics/wp-google-analytics.php
index 8d7cdf24b80c7..5c8655bd9a85f 100644
--- a/modules/google-analytics/wp-google-analytics.php
+++ b/modules/google-analytics/wp-google-analytics.php
@@ -20,7 +20,7 @@
 /**
  * Jetpack_Google_Analytics is the class that handles ALL of the plugin functionality.
  * It helps us avoid name collisions
- * http://codex.wordpress.org/Writing_a_Plugin#Avoiding_Function_Name_Collisions
+ * https://codex.wordpress.org/Writing_a_Plugin#Avoiding_Function_Name_Collisions
  */
 
 if ( ! defined( 'ABSPATH' ) ) {
diff --git a/modules/infinite-scroll/infinity.php b/modules/infinite-scroll/infinity.php
index 3cc5a60c2615f..6b8d3775b333b 100644
--- a/modules/infinite-scroll/infinity.php
+++ b/modules/infinite-scroll/infinity.php
@@ -4,13 +4,13 @@
 
 /*
 Plugin Name: The Neverending Home Page.
-Plugin URI: http://automattic.com/
+Plugin URI: https://automattic.com/
 Description: Adds infinite scrolling support to the front-end blog post view for themes, pulling the next set of posts automatically into view when the reader approaches the bottom of the page.
 Version: 1.1
 Author: Automattic
-Author URI: http://automattic.com/
+Author URI: https://automattic.com/
 License: GNU General Public License v2 or later
-License URI: http://www.gnu.org/licenses/gpl-2.0.html
+License URI: https://www.gnu.org/licenses/gpl-2.0.html
 */
 
 /**
diff --git a/modules/markdown/easy-markdown.php b/modules/markdown/easy-markdown.php
index 06a2cab903350..d8903d2c21794 100644
--- a/modules/markdown/easy-markdown.php
+++ b/modules/markdown/easy-markdown.php
@@ -2,18 +2,18 @@
 
 /*
 Plugin Name: Easy Markdown
-Plugin URI: http://automattic.com/
+Plugin URI: https://automattic.com/
 Description: Write in Markdown, publish in WordPress
 Version: 0.1
 Author: Matt Wiebe
-Author URI: http://automattic.com/
+Author URI: https://automattic.com/
 */
 
 /**
  * Copyright (c) Automattic. All rights reserved.
  *
  * Released under the GPL license
- * http://www.opensource.org/licenses/gpl-license.php
+ * https://www.opensource.org/licenses/gpl-license.php
  *
  * This is an add-on for WordPress
  * https://wordpress.org/
@@ -307,7 +307,7 @@ protected function get_support_url() {
 		 *
 		 * @param string $url Markdown support URL.
 		 */
-		return apply_filters( 'easy_markdown_support_url', 'http://en.support.wordpress.com/markdown-quick-reference/' );
+		return apply_filters( 'easy_markdown_support_url', 'https://en.support.wordpress.com/markdown-quick-reference/' );
 	}
 
 	/**
diff --git a/modules/masterbar/masterbar.php b/modules/masterbar/masterbar.php
index 3c6da4394ca88..de75ccc9f7fcc 100644
--- a/modules/masterbar/masterbar.php
+++ b/modules/masterbar/masterbar.php
@@ -597,7 +597,7 @@ public function add_me_submenu( $wp_admin_bar ) {
 
 		$user_info  = get_avatar( $this->user_email, 128, 'mm', '', array( 'force_display' => true ) );
 		$user_info .= '<span class="display-name">' . $this->display_name . '</span>';
-		$user_info .= '<a class="username" href="http://gravatar.com/' . $this->user_login . '">@' . $this->user_login . '</a>';
+		$user_info .= '<a class="username" href="https://gravatar.com/' . $this->user_login . '">@' . $this->user_login . '</a>';
 
 		$user_info .= sprintf(
 			'<div><a href="%s" class="ab-sign-out">%s</a></div>',
diff --git a/modules/minileven/minileven.php b/modules/minileven/minileven.php
index c7ab05e2e1a04..ba53ac7b9d4d1 100644
--- a/modules/minileven/minileven.php
+++ b/modules/minileven/minileven.php
@@ -8,7 +8,7 @@
 // http://alexking.org/projects/wordpress
 //
 // Released under the GPL license
-// http://www.opensource.org/licenses/gpl-license.php
+// https://www.opensource.org/licenses/gpl-license.php
 //
 // **********************************************************************
 // This program is distributed in the hope that it will be useful, but
@@ -220,7 +220,7 @@ function jetpack_mobile_theme_setup() {
 					exit;
 				break;
 				case 'ios':
-					header( 'Location: http://itunes.apple.com/us/app/wordpress/id335703880?mt=8' );
+					header( 'Location: https://itunes.apple.com/us/app/wordpress/id335703880?mt=8' );
 					exit;
 				break;
 				case 'blackberry':
diff --git a/modules/minileven/theme/pub/minileven/index.php b/modules/minileven/theme/pub/minileven/index.php
index 63a51a19da7fc..14a1afdc646a3 100644
--- a/modules/minileven/theme/pub/minileven/index.php
+++ b/modules/minileven/theme/pub/minileven/index.php
@@ -6,7 +6,7 @@
  * and one of the two required files for a theme (the other being style.css).
  * It is used to display a page when nothing more specific matches a query.
  * E.g., it puts together the home page when no home.php file exists.
- * Learn more: http://codex.wordpress.org/Template_Hierarchy
+ * Learn more: https://codex.wordpress.org/Template_Hierarchy
  *
  * @package Minileven
  */
diff --git a/modules/module-info.php b/modules/module-info.php
index f13964de081a0..0897521c080c9 100644
--- a/modules/module-info.php
+++ b/modules/module-info.php
@@ -78,7 +78,7 @@ function jetpack_shortcodes_more_info() {
  * Shortlinks support link.
  */
 function wpme_load_more_link() {
-	echo 'http://wp.me/p1moTy-DL';
+	echo 'https://wp.me/p1moTy-DL';
 }
 add_filter( 'jetpack_learn_more_button_shortlinks', 'wpme_load_more_link' );
 
diff --git a/modules/notes.php b/modules/notes.php
index 3b7ddfaa113c6..95be1faa27177 100644
--- a/modules/notes.php
+++ b/modules/notes.php
@@ -38,8 +38,7 @@ function __construct() {
 
 	function wpcom_static_url($file) {
 		$i = hexdec( substr( md5( $file ), -1 ) ) % 2;
-		$url = 'http://s' . $i . '.wp.com' . $file;
-		return set_url_scheme( $url );
+		return 'https://s' . $i . '.wp.com' . $file;
 	}
 
 	// return the major version of Internet Explorer the viewer is using or false if it's not IE
diff --git a/modules/post-by-email.php b/modules/post-by-email.php
index f25d4780f18dd..851303c12b626 100644
--- a/modules/post-by-email.php
+++ b/modules/post-by-email.php
@@ -99,7 +99,7 @@ function user_profile() {
 					<div id="jp-pbe-info"<?php echo $info_hidden; ?>>
 						<p id="jp-pbe-email-wrapper">
 							<input type="text" id="jp-pbe-email" value="<?php echo esc_attr( $email ); ?>" readonly="readonly" class="regular-text" />
-							<span class="description"><a target="_blank" href="http://jetpack.com/support/post-by-email/"><?php esc_html_e( 'More information', 'jetpack' ); ?></a></span>
+							<span class="description"><a target="_blank" href="https://jetpack.com/support/post-by-email/"><?php esc_html_e( 'More information', 'jetpack' ); ?></a></span>
 						</p>
 						<p>
 							<input type="button" name="jp-pbe-regenerate" id="jp-pbe-regenerate" class="button" value="<?php esc_attr_e( 'Regenerate Address', 'jetpack' ); ?> " />
diff --git a/modules/protect.php b/modules/protect.php
index a92dc5873dd93..23a6751d4a98d 100644
--- a/modules/protect.php
+++ b/modules/protect.php
@@ -184,7 +184,7 @@ public function admin_jetpack_manage_notice() {
 				<a class="button-primary" href="<?php echo esc_url( network_admin_url( 'plugins.php' ) ); ?>">
 					<?php esc_html_e( 'View Network Admin', 'jetpack' ); ?>
 				</a>
-				<a class="button" href="<?php echo esc_url( __( 'http://jetpack.com/support/multisite-protect', 'jetpack' ) ); ?>" target="_blank">
+				<a class="button" href="<?php echo esc_url( __( 'https://jetpack.com/support/multisite-protect', 'jetpack' ) ); ?>" target="_blank">
 					<?php esc_html_e( 'Learn More' ); ?>
 				</a>
 			</p>
diff --git a/modules/publicize/publicize.php b/modules/publicize/publicize.php
index c3972cf6f7728..3aa667b33ae0e 100644
--- a/modules/publicize/publicize.php
+++ b/modules/publicize/publicize.php
@@ -329,7 +329,7 @@ function get_profile_link( $service_name, $connection ) {
 		} elseif ( 'facebook' == $service_name && isset( $cmeta['connection_data']['meta']['facebook_page'] ) ) {
 			return 'https://facebook.com/' . $cmeta['connection_data']['meta']['facebook_page'];
 		} elseif ( 'tumblr' == $service_name && isset( $cmeta['connection_data']['meta']['tumblr_base_hostname'] ) ) {
-			 return 'http://' . $cmeta['connection_data']['meta']['tumblr_base_hostname'];
+			 return 'https://' . $cmeta['connection_data']['meta']['tumblr_base_hostname'];
 		} elseif ( 'twitter' == $service_name ) {
 			return 'https://twitter.com/' . substr( $cmeta['external_display'], 1 ); // Has a leading '@'
 		} else if ( 'linkedin' == $service_name ) {
@@ -347,7 +347,7 @@ function get_profile_link( $service_name, $connection ) {
 				return false;
 			}
 
-			return esc_url_raw( add_query_arg( 'id', urlencode( $id ), 'http://www.linkedin.com/profile/view' ) );
+			return esc_url_raw( add_query_arg( 'id', urlencode( $id ), 'https://www.linkedin.com/profile/view' ) );
 		} else {
 			return false; // no fallback. we just won't link it
 		}
diff --git a/modules/sharedaddy/sharedaddy.php b/modules/sharedaddy/sharedaddy.php
index 1e5de22cbc870..82fe7af2bc3e2 100644
--- a/modules/sharedaddy/sharedaddy.php
+++ b/modules/sharedaddy/sharedaddy.php
@@ -4,8 +4,8 @@
 Description: The most super duper sharing tool on the interwebs.
 Version: 0.3.1
 Author: Automattic, Inc.
-Author URI: http://automattic.com/
-Plugin URI: http://en.blog.wordpress.com/2010/08/24/more-ways-to-share/
+Author URI: https://automattic.com/
+Plugin URI: https://en.blog.wordpress.com/2010/08/24/more-ways-to-share/
 */
 
 require_once plugin_dir_path( __FILE__ ).'sharing.php';
@@ -222,7 +222,7 @@ function sharing_plugin_settings( $links ) {
 function sharing_add_plugin_settings($links, $file) {
 	if ( $file == basename( dirname( __FILE__ ) ).'/'.basename( __FILE__ ) ) {
 		$links[] = '<a href="options-general.php?page=sharing.php">' . __( 'Settings', 'jetpack' ) . '</a>';
-		$links[] = '<a href="http://support.wordpress.com/sharing/" rel="noopener noreferrer" target="_blank">' . __( 'Support', 'jetpack' ) . '</a>';
+		$links[] = '<a href="https://support.wordpress.com/sharing/" rel="noopener noreferrer" target="_blank">' . __( 'Support', 'jetpack' ) . '</a>';
 	}
 
 	return $links;
diff --git a/modules/sharedaddy/sharing.php b/modules/sharedaddy/sharing.php
index c36e0d1442f3a..805dc172ff145 100644
--- a/modules/sharedaddy/sharing.php
+++ b/modules/sharedaddy/sharing.php
@@ -214,7 +214,7 @@ public function management_page() {
 
 		if ( false == function_exists( 'mb_stripos' ) ) {
 			echo '<div id="message" class="updated fade"><h3>' . __( 'Warning! Multibyte support missing!', 'jetpack' ) . '</h3>';
-			echo '<p>' . sprintf( __( 'This plugin will work without it, but multibyte support is used <a href="%s" rel="noopener noreferrer" target="_blank">if available</a>. You may see minor problems with Tweets and other sharing services.', 'jetpack' ), 'http://www.php.net/manual/en/mbstring.installation.php' ) . '</p></div>';
+			echo '<p>' . sprintf( __( 'This plugin will work without it, but multibyte support is used <a href="%s" rel="noopener noreferrer" target="_blank">if available</a>. You may see minor problems with Tweets and other sharing services.', 'jetpack' ), 'https://www.php.net/manual/en/mbstring.installation.php' ) . '</p></div>';
 		}
 
 		if ( isset( $_GET['update'] ) && $_GET['update'] == 'saved' ) {
diff --git a/modules/shortcodes/archiveorg-book.php b/modules/shortcodes/archiveorg-book.php
index 88ac328c4cf4f..055b798d98204 100644
--- a/modules/shortcodes/archiveorg-book.php
+++ b/modules/shortcodes/archiveorg-book.php
@@ -4,7 +4,7 @@
  *
  * Usage:
  * [archiveorg-book goodytwoshoes00newyiala]
- * [archiveorg-book http://www.archive.org/stream/goodytwoshoes00newyiala]
+ * [archiveorg-book https://www.archive.org/stream/goodytwoshoes00newyiala]
  * [archiveorg id=goodytwoshoes00newyiala width=480 height=430]
 
  * <iframe src='https://www.archive.org/stream/goodytwoshoes00newyiala?ui=embed#mode/1up' width='480px' height='430px' frameborder='0' ></iframe>
@@ -76,7 +76,7 @@ function jetpack_archiveorg_book_shortcode( $atts ) {
 		$height = intval( $atts['height'] );
 	}
 
-	$url = esc_url( set_url_scheme( "http://archive.org/stream/{$id}?ui=embed#mode/1up" ) );
+	$url = esc_url( "https://archive.org/stream/{$id}?ui=embed#mode/1up" );
 
 	$html = "<div class='embed-archiveorg-book' style='text-align:center;'><iframe src='$url' width='$width' height='$height' style='border:0;' webkitallowfullscreen='true' mozallowfullscreen='true' allowfullscreen></iframe></div>";
 	return $html;
diff --git a/modules/shortcodes/archiveorg.php b/modules/shortcodes/archiveorg.php
index 4a335b32c74c0..8a331ed75fcfb 100644
--- a/modules/shortcodes/archiveorg.php
+++ b/modules/shortcodes/archiveorg.php
@@ -90,7 +90,7 @@ function jetpack_archiveorg_shortcode( $atts ) {
 		$poster = '';
 	}
 
-	$url = esc_url( set_url_scheme( "https://archive.org/embed/{$id}{$autoplay}{$poster}" ) );
+	$url = esc_url( "https://archive.org/embed/{$id}{$autoplay}{$poster}" );
 
 	$html = "<div class='embed-archiveorg' style='text-align:center;'><iframe src='$url' width='$width' height='$height' style='border:0;' webkitallowfullscreen='true' mozallowfullscreen='true' allowfullscreen></iframe></div>";
 
diff --git a/modules/shortcodes/brightcove.php b/modules/shortcodes/brightcove.php
index 584ccf2fc3750..4a08b9a8e38f3 100644
--- a/modules/shortcodes/brightcove.php
+++ b/modules/shortcodes/brightcove.php
@@ -53,7 +53,7 @@ public static function convert( $atts ) {
 	 * The latest: [shortcode a=1 b=2] and the legacy: [shortcode a=1&b=2]
 	 * For an old shortcode: [shortcode a=1&b=2&c=3], it would be parsed into array( 'a' => 1&b=2&c=3' ), which is useless.
 	 * However, since we want to determine whether to call convert_to_legacy_studio() or convert_to_new_studio() via passed parameters, we still need to parse the two properly.
-	 * See http://jetpack.wp-a2z.org/oik_api/shortcode_new_to_old_params/
+	 * See https://jetpack.wp-a2z.org/oik_api/shortcode_new_to_old_params/
 	 *
 	 * @since 4.5.0
 	 *
diff --git a/modules/shortcodes/dailymotion.php b/modules/shortcodes/dailymotion.php
index fd2d620fe19d8..0cb72935abd24 100644
--- a/modules/shortcodes/dailymotion.php
+++ b/modules/shortcodes/dailymotion.php
@@ -208,7 +208,7 @@ function dailymotion_shortcode( $atts ) {
 			&& array_key_exists( 'title', $atts )
 			&& $title
 		) {
-			$output .= '<br /><strong><a href="' . esc_url( 'http://www.dailymotion.com/video/' . $video ) . '" target="_blank">' . esc_html( $title ) . '</a></strong>';
+			$output .= '<br /><strong><a href="' . esc_url( 'https://www.dailymotion.com/video/' . $video ) . '" target="_blank">' . esc_html( $title ) . '</a></strong>';
 		}
 
 		$user = preg_replace( '/[^-a-z0-9_]/i', '', $atts['user'] );
@@ -218,7 +218,7 @@ function dailymotion_shortcode( $atts ) {
 				sprintf(
 					/* Translators: placeholder is a Dailymotion username, linking to a Dailymotion profile page. */
 					__( 'Uploaded by %s', 'jetpack' ),
-					'<a href="' . esc_url( 'http://www.dailymotion.com/' . $user ) . '" target="_blank">' . esc_html( $user ) . '</a>'
+					'<a href="' . esc_url( 'https://www.dailymotion.com/' . $user ) . '" target="_blank">' . esc_html( $user ) . '</a>'
 				),
 				array(
 					'a' => array(
diff --git a/modules/shortcodes/flickr.php b/modules/shortcodes/flickr.php
index 73db117203b79..9691a88a2a710 100644
--- a/modules/shortcodes/flickr.php
+++ b/modules/shortcodes/flickr.php
@@ -135,9 +135,7 @@ function flickr_shortcode_handler( $atts ) {
 		return '';
 	}
 
-	if ( is_ssl() ) {
-		$src = str_replace( 'http://', 'https://', $src );
-	}
+	$src = str_replace( 'http://', 'https://', $src );
 
 	if ( 'video' === $showing ) {
 
@@ -186,7 +184,6 @@ function flickr_shortcode_handler( $atts ) {
  */
 function flickr_shortcode_video_markup( $atts ) {
 	$atts = array_map( 'esc_attr', $atts );
-	$http = ( is_ssl() ) ? 'https://' : 'http://';
 
 	$photo_vars = "photo_id=$atts[photo_id]";
 	if ( isset( $atts['secret'] ) ) {
@@ -194,7 +191,7 @@ function flickr_shortcode_video_markup( $atts ) {
 	}
 
 	return <<<EOD
-<object type="application/x-shockwave-flash" width="$atts[w]" height="$atts[h]" data="{$http}www.flickr.com/apps/video/stewart.swf?v=1.161" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"> <param name="flashvars" value="$photo_vars&amp;flickr_show_info_box=$atts[show_info]"></param><param name="movie" value="{$http}www.flickr.com/apps/video/stewart.swf?v=1.161"></param><param name="bgcolor" value="#000000"></param><param name="allowFullScreen" value="true"></param><param name="wmode" value="opaque"></param><embed type="application/x-shockwave-flash" src="{$http}www.flickr.com/apps/video/stewart.swf?v=1.161" bgcolor="#000000" allowfullscreen="true" flashvars="$photo_vars&amp;flickr_show_info_box=$atts[show_info]" wmode="opaque" height="$atts[h]" width="$atts[w]"></embed></object>
+<object type="application/x-shockwave-flash" width="$atts[w]" height="$atts[h]" data="https://www.flickr.com/apps/video/stewart.swf?v=1.161" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"> <param name="flashvars" value="$photo_vars&amp;flickr_show_info_box=$atts[show_info]"></param><param name="movie" value="https://www.flickr.com/apps/video/stewart.swf?v=1.161"></param><param name="bgcolor" value="#000000"></param><param name="allowFullScreen" value="true"></param><param name="wmode" value="opaque"></param><embed type="application/x-shockwave-flash" src="https://www.flickr.com/apps/video/stewart.swf?v=1.161" bgcolor="#000000" allowfullscreen="true" flashvars="$photo_vars&amp;flickr_show_info_box=$atts[show_info]" wmode="opaque" height="$atts[h]" width="$atts[w]"></embed></object>
 EOD;
 }
 
diff --git a/modules/shortcodes/googlemaps.php b/modules/shortcodes/googlemaps.php
index 435e8da0aa7b9..1871aff371f0f 100644
--- a/modules/shortcodes/googlemaps.php
+++ b/modules/shortcodes/googlemaps.php
@@ -108,9 +108,7 @@ function jetpack_googlemaps_shortcode( $atts ) {
 		}
 		$url = substr( $url, 0, -5 );
 
-		if ( is_ssl() ) {
-			$url = str_replace( 'http://', 'https://', $url );
-		}
+		$url = str_replace( 'http://', 'https://', $url );
 
 		$css_class = 'googlemaps';
 
diff --git a/modules/shortcodes/gravatar.php b/modules/shortcodes/gravatar.php
index cb709af9d2c47..f84f1c2428092 100644
--- a/modules/shortcodes/gravatar.php
+++ b/modules/shortcodes/gravatar.php
@@ -94,7 +94,7 @@ function jetpack_gravatar_profile_shortcode( $atts ) {
 	}
 
 	// Render the shortcode.
-	$gravatar_url = set_url_scheme( 'http://gravatar.com/' . $user->user_login );
+	$gravatar_url = 'https://gravatar.com/' . $user->user_login;
 
 	if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
 		$avatar_url    = wpcom_get_avatar_url( $user->ID, 96 );
diff --git a/modules/shortcodes/instagram.php b/modules/shortcodes/instagram.php
index 5a3280a5e2440..69a28a5e2a2c1 100644
--- a/modules/shortcodes/instagram.php
+++ b/modules/shortcodes/instagram.php
@@ -1,7 +1,4 @@
 <?php
-
-use Automattic\Jetpack\Assets;
-
 /**
  * Instagram Embeds.
  *
@@ -16,6 +13,8 @@
  * @package Jetpack
  */
 
+use Automattic\Jetpack\Assets;
+
 /**
  * Embed Reversal for Instagram
  *
@@ -110,7 +109,7 @@ function jetpack_instagram_handler( $matches, $atts, $url ) {
 	if ( is_feed() ) {
 		// Instagram offers direct links to images, but not to videos.
 		if ( 'p' === $matches[1] ) {
-			$media_url = sprintf( 'http://instagr.am/p/%1$s/media/?size=l', $matches[2] );
+			$media_url = sprintf( 'https://instagr.am/p/%1$s/media/?size=l', $matches[2] );
 			return sprintf(
 				'<a href="%1$s" title="%2$s" target="_blank"><img src="%3$s" alt="%4$s" /></a>',
 				esc_url( $url ),
diff --git a/modules/shortcodes/scribd.php b/modules/shortcodes/scribd.php
index b7e470ec423cc..a0101ad2cac44 100644
--- a/modules/shortcodes/scribd.php
+++ b/modules/shortcodes/scribd.php
@@ -52,7 +52,7 @@ function scribd_shortcode_handler( $atts ) {
 function scribd_shortcode_markup( $atts ) {
 	$markup = <<<EOD
 <iframe class="scribd_iframe_embed" src="//www.scribd.com/embeds/$atts[id]/content?start_page=1&view_mode=$atts[mode]&access_key=$atts[key]" data-auto-height="true" scrolling="no" id="scribd_$atts[id]" width="100%" height="500" frameborder="0"></iframe>
-<div style="font-size:10px;text-align:center;width:100%"><a href="http://www.scribd.com/doc/$atts[id]" target="_blank">View this document on Scribd</a></div>
+<div style="font-size:10px;text-align:center;width:100%"><a href="https://www.scribd.com/doc/$atts[id]" target="_blank">View this document on Scribd</a></div>
 EOD;
 
 	return $markup;
diff --git a/modules/shortcodes/ted.php b/modules/shortcodes/ted.php
index bbf093cf0b375..b26ef1da2736d 100644
--- a/modules/shortcodes/ted.php
+++ b/modules/shortcodes/ted.php
@@ -13,8 +13,8 @@
  * @package Jetpack
  */
 
-wp_oembed_add_provider( '!https?://(www\.)?ted.com/talks/view/id/.+!i', 'http://www.ted.com/talks/oembed.json', true );
-wp_oembed_add_provider( '!https?://(www\.)?ted.com/talks/[a-zA-Z\-\_]+\.html!i', 'http://www.ted.com/talks/oembed.json', true );
+wp_oembed_add_provider( '!https?://(www\.)?ted.com/talks/view/id/.+!i', 'https://www.ted.com/talks/oembed.json', true );
+wp_oembed_add_provider( '!https?://(www\.)?ted.com/talks/[a-zA-Z\-\_]+\.html!i', 'https://www.ted.com/talks/oembed.json', true );
 
 /**
  * Get the unique ID of a TED video.
@@ -48,9 +48,9 @@ function shortcode_ted( $atts ) {
 
 	$url = '';
 	if ( preg_match( '#^[\d]+$#', $atts['id'], $matches ) ) {
-		$url = 'http://ted.com/talks/view/id/' . $matches[0];
+		$url = 'https://ted.com/talks/view/id/' . $matches[0];
 	} elseif ( preg_match( '#^https?://(www\.)?ted\.com/talks/view/id/[0-9]+$#', $atts['id'], $matches ) ) {
-		$url = $matches[0];
+		$url = set_url_scheme( $matches[0], 'https' );
 	}
 
 	unset( $atts['id'] );
diff --git a/modules/sitemaps/sitemap-builder.php b/modules/sitemaps/sitemap-builder.php
index e04f58d5ab845..d6077c0fd3226 100644
--- a/modules/sitemaps/sitemap-builder.php
+++ b/modules/sitemaps/sitemap-builder.php
@@ -998,7 +998,7 @@ private function build_one_sitemap_index( $number, $from_id, $datetime, $index_t
 	/**
 	 * Construct the sitemap index url entry for a sitemap row.
 	 *
-	 * @link http://www.sitemaps.org/protocol.html#sitemapIndex_sitemap
+	 * @link https://www.sitemaps.org/protocol.html#sitemapIndex_sitemap
 	 *
 	 * @access private
 	 * @since 4.8.0
@@ -1104,7 +1104,7 @@ public function news_sitemap_xml() {
 	/**
 	 * Construct the sitemap url entry for a WP_Post.
 	 *
-	 * @link http://www.sitemaps.org/protocol.html#urldef
+	 * @link https://www.sitemaps.org/protocol.html#urldef
 	 * @access private
 	 * @since 4.8.0
 	 *
@@ -1182,7 +1182,7 @@ private function post_to_sitemap_item( $post ) {
 	/**
 	 * Construct the image sitemap url entry for a WP_Post of image type.
 	 *
-	 * @link http://www.sitemaps.org/protocol.html#urldef
+	 * @link https://www.sitemaps.org/protocol.html#urldef
 	 *
 	 * @access private
 	 * @since 4.8.0
@@ -1267,7 +1267,7 @@ private function image_post_to_sitemap_item( $post ) {
 	/**
 	 * Construct the video sitemap url entry for a WP_Post of video type.
 	 *
-	 * @link http://www.sitemaps.org/protocol.html#urldef
+	 * @link https://www.sitemaps.org/protocol.html#urldef
 	 * @link https://developers.google.com/webmasters/videosearch/sitemaps
 	 *
 	 * @access private
@@ -1377,7 +1377,7 @@ private function video_post_to_sitemap_item( $post ) {
 	/**
 	 * Construct the news sitemap url entry for a WP_Post.
 	 *
-	 * @link http://www.sitemaps.org/protocol.html#urldef
+	 * @link https://www.sitemaps.org/protocol.html#urldef
 	 *
 	 * @access private
 	 * @since 4.8.0
@@ -1417,7 +1417,7 @@ private function post_to_news_sitemap_item( $post ) {
 		/*
 		 * Trim the locale to an ISO 639 language code as required by Google.
 		 * Special cases are zh-cn (Simplified Chinese) and zh-tw (Traditional Chinese).
-		 * @link http://www.loc.gov/standards/iso639-2/php/code_list.php
+		 * @link https://www.loc.gov/standards/iso639-2/php/code_list.php
 		 */
 		$language = strtolower( get_locale() );
 
diff --git a/modules/sitemaps/sitemap-constants.php b/modules/sitemaps/sitemap-constants.php
index 3c4fca9404183..ed0ccad0c388f 100644
--- a/modules/sitemaps/sitemap-constants.php
+++ b/modules/sitemaps/sitemap-constants.php
@@ -27,7 +27,7 @@
  * Maximum size (in bytes) of a sitemap xml file.
  * Max is 716800 = 700kb to avoid potential failures for default memcached limits (1MB)
  *
- * @link http://www.sitemaps.org/
+ * @link https://www.sitemaps.org/
  * @since 4.8.0
  */
 if ( ! defined( 'JP_SITEMAP_MAX_BYTES' ) ) {
@@ -38,7 +38,7 @@
  * Maximum size (in url nodes) of a sitemap xml file.
  * Per the spec, max value is 50000.
  *
- * @link http://www.sitemaps.org/
+ * @link https://www.sitemaps.org/
  * @since 4.8.0
  */
 if ( ! defined( 'JP_SITEMAP_MAX_ITEMS' ) ) {
diff --git a/modules/sitemaps/sitemap-stylist.php b/modules/sitemaps/sitemap-stylist.php
index ce883d7f14eec..7ee953b0f8ae1 100644
--- a/modules/sitemaps/sitemap-stylist.php
+++ b/modules/sitemaps/sitemap-stylist.php
@@ -33,7 +33,7 @@ class Jetpack_Sitemap_Stylist {
 	 *
 	 * @access private
 	 * @since 4.8.0
-	 * @link http://php.net/manual/en/function.vsprintf.php Format string documentation.
+	 * @link https://php.net/manual/en/function.vsprintf.php Format string documentation.
 	 *
 	 * @param string $format A vsprintf-style format string to be sanitized.
 	 * @param array  $url_array The string substitution array to be passed to vsprintf.
@@ -74,7 +74,7 @@ public static function sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://jetpack.com/',
+				1 => 'https://jetpack.com/',
 				2 => 'https://www.google.com/',
 				3 => 'https://www.bing.com/',
 			)
@@ -86,7 +86,7 @@ public static function sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://sitemaps.org',
+				1 => 'https://sitemaps.org',
 			)
 		);
 
@@ -186,7 +186,7 @@ public static function sitemap_index_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://jetpack.com/',
+				1 => 'https://jetpack.com/',
 				2 => 'https://www.google.com/',
 				3 => 'https://www.bing.com/',
 			)
@@ -206,7 +206,7 @@ public static function sitemap_index_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://sitemaps.org',
+				1 => 'https://sitemaps.org',
 			)
 		);
 
@@ -314,7 +314,7 @@ public static function image_sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://jetpack.com/',
+				1 => 'https://jetpack.com/',
 				2 => 'https://www.google.com/',
 				3 => 'https://www.bing.com/',
 			)
@@ -326,7 +326,7 @@ public static function image_sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://sitemaps.org',
+				1 => 'https://sitemaps.org',
 			)
 		);
 
@@ -454,7 +454,7 @@ public static function video_sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://jetpack.com/',
+				1 => 'https://jetpack.com/',
 				2 => 'https://www.google.com/',
 				3 => 'https://www.bing.com/',
 			)
@@ -466,7 +466,7 @@ public static function video_sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://sitemaps.org',
+				1 => 'https://sitemaps.org',
 			)
 		);
 
@@ -594,7 +594,7 @@ public static function news_sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://jetpack.com/',
+				1 => 'https://jetpack.com/',
 				2 => 'https://www.google.com/',
 				3 => 'https://www.bing.com/',
 			)
@@ -606,7 +606,7 @@ public static function news_sitemap_xsl() {
 				'jetpack'
 			),
 			array(
-				1 => 'http://sitemaps.org',
+				1 => 'https://sitemaps.org',
 			)
 		);
 
diff --git a/modules/sitemaps/sitemaps.php b/modules/sitemaps/sitemaps.php
index d374020398667..9fcd0529632d1 100644
--- a/modules/sitemaps/sitemaps.php
+++ b/modules/sitemaps/sitemaps.php
@@ -14,7 +14,7 @@
  *    well as the home url. To include other post types use the 'jetpack_sitemap_post_types'
  *    filter.
  *
- * @link http://sitemaps.org/protocol.php Base sitemaps protocol.
+ * @link https://www.sitemaps.org/protocol.html Base sitemaps protocol.
  * @link https://support.google.com/webmasters/answer/178636 Image sitemap extension.
  * @link https://developers.google.com/webmasters/videosearch/sitemaps Video sitemap extension.
  *
@@ -23,7 +23,7 @@
  *    completeness, instead including at most 1000 of the most recent published posts
  *    from the previous 2 days, per the news-sitemap spec.
  *
- * @link http://www.google.com/support/webmasters/bin/answer.py?answer=74288 News sitemap extension.
+ * @link https://support.google.com/webmasters/answer/74288 News sitemap extension.
  *
  * @package Jetpack
  * @since 3.9.0
@@ -546,7 +546,7 @@ public function callback_action_filter_sitemap_location() {
 			 * This way we don't have to wait for init to finish before building sitemaps.
 			 *
 			 * @link https://tools.ietf.org/html/rfc3986#section-3.3 RFC 3986
-			 * @link http://www.sitemaps.org/ The sitemap protocol
+			 * @link https://www.sitemaps.org/ The sitemap protocol
 			 *
 			 * @since 4.8.0
 			 */
diff --git a/modules/subscriptions/views.php b/modules/subscriptions/views.php
index 380d2493ccc8e..fc578db4f10f7 100644
--- a/modules/subscriptions/views.php
+++ b/modules/subscriptions/views.php
@@ -164,7 +164,7 @@ static function render_widget_status_messages( $instance ) {
 			switch ( $_GET['blogsub'] ) {
 				case 'confirming':
 					echo "<div style='background-color: #{$themecolors['bg']}; border: 1px solid #{$themecolors['border']}; color: #{$themecolors['text']}; padding-left: 5px; padding-right: 5px; margin-bottom: 10px;'>";
-					_e( 'Thanks for subscribing! You&rsquo;ll get an email with a link to confirm your subscription. If you don&rsquo;t get it, please <a href="http://en.support.wordpress.com/contact/">contact us</a>.' );
+					_e( 'Thanks for subscribing! You&rsquo;ll get an email with a link to confirm your subscription. If you don&rsquo;t get it, please <a href="https://en.support.wordpress.com/contact/">contact us</a>.' );
 					echo "</div>";
 					break;
 				case 'blocked':
@@ -189,7 +189,7 @@ static function render_widget_status_messages( $instance ) {
 					break;
 				case 'pending':
 					echo "<div style='background-color: #{$themecolors['bg']}; border: 1px solid #{$themecolors['border']}; color: #{$themecolors['text']}; padding-left: 5px; padding-right: 5px; margin-bottom: 10px;'>";
-					_e( 'You have a pending subscription already; we just sent you another email. Click the link or <a href="http://en.support.wordpress.com/contact/">contact us</a> if you don&rsquo;t receive it.' );
+					_e( 'You have a pending subscription already; we just sent you another email. Click the link or <a href="https://en.support.wordpress.com/contact/">contact us</a> if you don&rsquo;t receive it.' );
 					echo "</div>";
 					break;
 				case 'confirmed':
diff --git a/modules/theme-tools/compat/twentyfifteen.php b/modules/theme-tools/compat/twentyfifteen.php
index adaa42b7f6830..b51149c62001b 100644
--- a/modules/theme-tools/compat/twentyfifteen.php
+++ b/modules/theme-tools/compat/twentyfifteen.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Jetpack Compatibility File
- * See: http://jetpack.com/
+ * See: https://jetpack.com/
  */
 
 function twentyfifteen_jetpack_setup() {
diff --git a/modules/theme-tools/compat/twentynineteen.php b/modules/theme-tools/compat/twentynineteen.php
index fcc8b8c1397c5..12d9b74a57d62 100644
--- a/modules/theme-tools/compat/twentynineteen.php
+++ b/modules/theme-tools/compat/twentynineteen.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Jetpack Compatibility File
- * See: http://jetpack.com/
+ * See: https://jetpack.com/
  */
 
 function twentynineteen_jetpack_setup() {
diff --git a/modules/theme-tools/compat/twentyseventeen.php b/modules/theme-tools/compat/twentyseventeen.php
index 4a60e504df662..284b54a468cec 100644
--- a/modules/theme-tools/compat/twentyseventeen.php
+++ b/modules/theme-tools/compat/twentyseventeen.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Jetpack Compatibility File
- * See: http://jetpack.com/
+ * See: https://jetpack.com/
  */
 
 function twentyseventeen_jetpack_setup() {
diff --git a/modules/theme-tools/compat/twentysixteen.php b/modules/theme-tools/compat/twentysixteen.php
index 816a74b520922..439a3e95a8963 100644
--- a/modules/theme-tools/compat/twentysixteen.php
+++ b/modules/theme-tools/compat/twentysixteen.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Jetpack Compatibility File
- * See: http://jetpack.com/
+ * See: https://jetpack.com/
  */
 
 function twentysixteen_jetpack_setup() {
diff --git a/modules/theme-tools/featured-content.php b/modules/theme-tools/featured-content.php
index 52e2b12f39651..c70408c8c720c 100644
--- a/modules/theme-tools/featured-content.php
+++ b/modules/theme-tools/featured-content.php
@@ -503,7 +503,7 @@ public static function customize_register( $wp_customize ) {
 			Add Featured Content settings.
 			 *
 			 * Sanitization callback registered in Featured_Content::validate_settings().
-			 * See http://themeshaper.com/2013/04/29/validation-sanitization-in-customizer/comment-page-1/#comment-12374
+			 * See https://themeshaper.com/2013/04/29/validation-sanitization-in-customizer/comment-page-1/#comment-12374
 			 */
 			$wp_customize->add_setting(
 				'featured-content[tag-name]',
diff --git a/modules/theme-tools/random-redirect.php b/modules/theme-tools/random-redirect.php
index d866d336e3f2e..e78e0277eae99 100644
--- a/modules/theme-tools/random-redirect.php
+++ b/modules/theme-tools/random-redirect.php
@@ -5,12 +5,12 @@
 Description: Allows you to create a link to yourblog.example.com/?random which will redirect someone to a random post on your blog, in a StumbleUpon-like fashion.
 Version: 1.2-wpcom
 Author: Matt Mullenweg
-Author URI: http://photomatt.net/
+Author URI: https://ma.tt/
 */
 
 function jetpack_matt_random_redirect() {
 	// Verify that the Random Redirect plugin this code is from is not active
-	// See http://plugins.trac.wordpress.org/ticket/1898
+	// See https://plugins.trac.wordpress.org/ticket/1898
 	if ( ! ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) {
 		require_once ABSPATH . 'wp-admin/includes/plugin.php';
 		if ( is_plugin_active( 'random-redirect/random-redirect.php' ) ) {
@@ -49,7 +49,7 @@ function jetpack_matt_random_redirect() {
 
 	// Persistent AppEngine abuse.  ORDER BY RAND is expensive.
 	if ( strstr( $_SERVER['HTTP_USER_AGENT'], 'AppEngine-Google' ) ) {
-		wp_die( 'Please <a href="http://en.support.wordpress.com/contact/" rel="noopener noreferrer" target="_blank">contact support</a>' );
+		wp_die( 'Please <a href="https://en.support.wordpress.com/contact/" rel="noopener noreferrer" target="_blank">contact support</a>' );
 	}
 
 	// Set the category ID if the parameter is set.
diff --git a/modules/theme-tools/site-logo.php b/modules/theme-tools/site-logo.php
index 04f16b7162492..cef77e69ba1b3 100644
--- a/modules/theme-tools/site-logo.php
+++ b/modules/theme-tools/site-logo.php
@@ -1,7 +1,7 @@
 <?php
 /*
  * Site Logo.
- * @see http://jetpack.com/support/site-logo/
+ * @see https://jetpack.com/support/site-logo/
  *
  * This feature will only be activated for themes that declare their support.
  * This can be done by adding code similar to the following during the
diff --git a/modules/verification-tools/blog-verification-tools.php b/modules/verification-tools/blog-verification-tools.php
index 593e80c5fc940..9b53000adf6e8 100644
--- a/modules/verification-tools/blog-verification-tools.php
+++ b/modules/verification-tools/blog-verification-tools.php
@@ -13,7 +13,7 @@ function jetpack_verification_services() {
 			'name'   => 'Bing Webmaster Center',
 			'key'    => 'msvalidate.01',
 			'format' => '12C1203B5086AECE94EB3A3D9830B2E',
-			'url'    => 'http://www.bing.com/webmaster/',
+			'url'    => 'https://www.bing.com/toolbox/webmaster/',
 		),
 		'pinterest' => array(
 			'name'   => 'Pinterest Site Verification',
diff --git a/modules/videopress/class.videopress-player.php b/modules/videopress/class.videopress-player.php
index 669523c9bd08e..ab5105df94060 100644
--- a/modules/videopress/class.videopress-player.php
+++ b/modules/videopress/class.videopress-player.php
@@ -305,7 +305,7 @@ private function html_age_gate() {
 		$html .= '<input type="submit" value="' . __( 'Submit', 'jetpack' ) . '" style="cursor:pointer;border-radius: 1em;border:1px solid #333;background-color:#333;background:-webkit-gradient( linear, left top, left bottom, color-stop(0.0, #444), color-stop(1, #111) );background:-moz-linear-gradient(center top, #444 0%, #111 100%);font-size:13px;padding:4px 10px 5px;line-height:1em;vertical-align:top;color:white;text-decoration:none;margin:0" />';
 
 		$html .= '</fieldset>';
-		$html .= '<p style="padding-top:20px;padding-bottom:60px;text-align:' . $text_align . ';"><a rel="nofollow noopener noreferrer" href="http://videopress.com/" target="_blank" style="color:rgb(128,128,128);text-decoration:underline;font-size:15px">' . __( 'More information', 'jetpack' ) . '</a></p>';
+		$html .= '<p style="padding-top:20px;padding-bottom:60px;text-align:' . $text_align . ';"><a rel="nofollow noopener noreferrer" href="https://videopress.com/" target="_blank" style="color:rgb(128,128,128);text-decoration:underline;font-size:15px">' . __( 'More information', 'jetpack' ) . '</a></p>';
 
 		$html .= '</div>';
 		return $html;
@@ -317,7 +317,7 @@ private function html_age_gate() {
 	 * No Flash fallback.
 	 *
 	 * @since 1.2
-	 * @link http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html HTML5 video
+	 * @link https://html.spec.whatwg.org/multipage/media.html#the-video-element HTML5 video
 	 * @return string HTML5 video element and children
 	 */
 	private function html5_static() {
@@ -359,7 +359,7 @@ private function html5_static() {
 		}
 		$html .= '" src="' . $thumbnail . '" width="' . $this->video->calculated_width . '" height="' . $this->video->calculated_height . '" /></div>';
 		if ( isset( $this->options['freedom'] ) && $this->options['freedom'] === true ) {
-			$html .= '<p class="robots-nocontent">' . sprintf( __( 'You do not have sufficient <a rel="nofollow noopener noreferrer" href="%s" target="_blank">freedom levels</a> to view this video. Support free software and upgrade.', 'jetpack' ), 'http://www.gnu.org/philosophy/free-sw.html' ) . '</p>';
+			$html .= '<p class="robots-nocontent">' . sprintf( __( 'You do not have sufficient <a rel="nofollow noopener noreferrer" href="%s" target="_blank">freedom levels</a> to view this video. Support free software and upgrade.', 'jetpack' ), 'https://www.gnu.org/philosophy/free-sw.html' ) . '</p>';
 		} elseif ( isset( $this->video->title ) ) {
 			$html .= '<p>' . esc_html( $this->video->title ) . '</p>';
 		}
@@ -516,7 +516,7 @@ private function html5_dynamic() {
 		if ( $age_gate_required ) {
 			$html .= 'if ( jQuery.VideoPress.support.flash() ) {' . PHP_EOL;
 			/**
-			 * @link http://code.google.com/p/swfobject/wiki/api#swfobject.embedSWF(swfUrlStr,_replaceElemIdStr,_widthStr,_height
+			 * @link https://github.com/swfobject/swfobject/wiki/SWFObject-API#swfobjectembedswfswfurlstr-replaceelemidstr-widthstr-heightstr-swfversionstr-xiswfurlstr-flashvarsobj-parobj-attobj-callbackfn
 			 */
 			$html .= 'swfobject.embedSWF(' . implode(
 				',',
@@ -688,11 +688,11 @@ function html5_dynamic_next() {
 	 * Only allow legitimate Flash parameters and their values
 	 *
 	 * @since 1.2
-	 * @link http://kb2.adobe.com/cps/127/tn_12701.html Flash object and embed attributes
-	 * @link http://kb2.adobe.com/cps/133/tn_13331.html devicefont
-	 * @link http://kb2.adobe.com/cps/164/tn_16494.html allowscriptaccess
-	 * @link http://www.adobe.com/devnet/flashplayer/articles/full_screen_mode.html full screen mode
-	 * @link http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00001079.html allownetworking
+	 * @link https://helpx.adobe.com/flash/kb/flash-object-embed-tag-attributes.html Flash object and embed attributes
+	 * @link https://helpx.adobe.com/flash/kb/font-outlines-device-fonts.html devicefont
+	 * @link https://helpx.adobe.com/flash/kb/control-access-scripts-host-web.html allowscriptaccess
+	 * @link https://www.adobe.com/devnet/flashplayer/articles/full_screen_mode.html full screen mode
+	 * @link https://help.adobe.com/en_US/as3/dev/WS1EFE2EDA-026D-4d14-864E-79DFD56F87C6.html allownetworking
 	 * @param array $flash_params Flash parameters expressed in key-value form
 	 * @return array validated Flash parameters
 	 */
@@ -796,7 +796,7 @@ private function get_flash_parameters() {
 	 * Flash player markup in a HTML embed element.
 	 *
 	 * @since 1.1
-	 * @link http://www.whatwg.org/specs/web-apps/current-work/multipage/the-iframe-element.html#the-embed-element embed element
+	 * @link https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-embed-element embed element
 	 * @link http://www.google.com/support/reader/bin/answer.py?answer=70664 Google Reader markup support
 	 * @return string HTML markup. Embed element with no children
 	 */
@@ -849,7 +849,7 @@ private function flash_object() {
 		foreach ( $this->get_flash_parameters() as $attribute => $value ) {
 			$flash_params .= '<param name="' . esc_attr( $attribute ) . '" value="' . esc_attr( $value ) . '" />';
 		}
-		$flash_help       = sprintf( __( 'This video requires <a rel="nofollow noopener noreferrer" href="%s" target="_blank">Adobe Flash</a> for playback.', 'jetpack' ), 'http://www.adobe.com/go/getflashplayer' );
+		$flash_help       = sprintf( __( 'This video requires <a rel="nofollow noopener noreferrer" href="%s" target="_blank">Adobe Flash</a> for playback.', 'jetpack' ), 'https://get.adobe.com/flashplayer/' );
 		$flash_player_url = esc_url( $this->video->players->swf->url, array( 'http', 'https' ) );
 		$description      = '';
 		if ( isset( $this->video->title ) ) {
diff --git a/modules/videopress/class.videopress-video.php b/modules/videopress/class.videopress-video.php
index a8c3a6b80491e..f75c1d6696a46 100644
--- a/modules/videopress/class.videopress-video.php
+++ b/modules/videopress/class.videopress-video.php
@@ -336,10 +336,7 @@ private function get_data() {
 			$request_params['maxwidth'] = $this->maxwidth;
 		}
 
-		$url = 'http://videopress.com/data/wordpress.json';
-		if ( is_ssl() ) {
-			$url = 'https://v.wordpress.com/data/wordpress.json';
-		}
+		$url = 'https://v.wordpress.com/data/wordpress.json';
 
 		$response = wp_remote_get(
 			add_query_arg( $request_params, $url ),
diff --git a/modules/videopress/shortcode.php b/modules/videopress/shortcode.php
index 21b163efca82d..a24bfaad815d5 100644
--- a/modules/videopress/shortcode.php
+++ b/modules/videopress/shortcode.php
@@ -13,7 +13,7 @@ class VideoPress_Shortcode {
 	protected function __construct() {
 
 		// By explicitly declaring the provider here, we can speed things up by not relying on oEmbed discovery.
-		wp_oembed_add_provider( '#^https?://videopress.com/v/.*#', 'http://public-api.wordpress.com/oembed/1.0/', true );
+		wp_oembed_add_provider( '#^https?://videopress.com/v/.*#', 'https://public-api.wordpress.com/oembed/1.0/', true );
 
 		add_shortcode( 'videopress', array( $this, 'shortcode_callback' ) );
 		add_shortcode( 'wpvideo', array( $this, 'shortcode_callback' ) );
@@ -44,7 +44,7 @@ public static function initialize() {
 	 * [videopress OcobLTqC]
 	 * [wpvideo OcobLTqC]
 	 *
-	 * @link http://codex.wordpress.org/Shortcode_API Shortcode API
+	 * @link https://codex.wordpress.org/Shortcode_API Shortcode API
 	 * @param array $attr shortcode attributes
 	 * @return string HTML markup or blank string on fail
 	 */
diff --git a/modules/videopress/utility-functions.php b/modules/videopress/utility-functions.php
index 9bdb9a735d9a9..989eaf5251b14 100644
--- a/modules/videopress/utility-functions.php
+++ b/modules/videopress/utility-functions.php
@@ -71,7 +71,7 @@ function videopress_get_video_details( $guid ) {
 /**
  * Get an attachment ID given a URL.
  *
- * Modified from http://wpscholar.com/blog/get-attachment-id-from-wp-image-url/
+ * Modified from https://wpscholar.com/blog/get-attachment-id-from-wp-image-url/
  *
  * @todo: Add some caching in here.
  *
diff --git a/modules/widgets/flickr/form.php b/modules/widgets/flickr/form.php
index 00fccc15be183..0dfc5c9a9ca7e 100644
--- a/modules/widgets/flickr/form.php
+++ b/modules/widgets/flickr/form.php
@@ -30,7 +30,7 @@ class="widefat"
 	<small>
 		<?php printf(
 			__( 'Leave the Flickr RSS URL field blank to display <a target="_blank" href="%s">interesting</a> Flickr photos.', 'jetpack' ),
-			'http://www.flickr.com/explore/interesting'
+			'https://www.flickr.com/explore/interesting'
 		); ?>
 	</small>
 </p>
diff --git a/modules/widgets/gallery.php b/modules/widgets/gallery.php
index 61f9354aa4c82..aa631e620dff5 100644
--- a/modules/widgets/gallery.php
+++ b/modules/widgets/gallery.php
@@ -5,7 +5,7 @@
 Description: Gallery widget
 Author: Automattic Inc.
 Version: 1.0
-Author URI: http://automattic.com
+Author URI: https://automattic.com
 */
 
 use Automattic\Jetpack\Assets;
diff --git a/modules/widgets/google-translate.php b/modules/widgets/google-translate.php
index 71f5d577a301e..8774231702385 100644
--- a/modules/widgets/google-translate.php
+++ b/modules/widgets/google-translate.php
@@ -4,11 +4,11 @@
 
 /**
  * Plugin Name: Google Translate Widget for WordPress.com
- * Plugin URI: http://automattic.com
+ * Plugin URI: https://automattic.com
  * Description: Add a widget for automatic translation
  * Author: Artur Piszek
  * Version: 0.1
- * Author URI: http://automattic.com
+ * Author URI: https://automattic.com
  * Text Domain: jetpack
  */
 if ( ! defined( 'ABSPATH' ) ) {
diff --git a/modules/widgets/gravatar-profile.php b/modules/widgets/gravatar-profile.php
index f5171665f566c..2dd4e5fbde069 100644
--- a/modules/widgets/gravatar-profile.php
+++ b/modules/widgets/gravatar-profile.php
@@ -11,7 +11,7 @@ function jetpack_gravatar_profile_widget_init() {
 
 /**
  * Display a widgetized version of your Gravatar Profile
- * http://blog.gravatar.com/2010/03/26/gravatar-profiles/
+ * https://blog.gravatar.com/2010/03/26/gravatar-profiles/
  */
 class Jetpack_Gravatar_Profile_Widget extends WP_Widget {
 
diff --git a/modules/widgets/image-widget.php b/modules/widgets/image-widget.php
index 37a353c19f808..d455b4c2993ab 100644
--- a/modules/widgets/image-widget.php
+++ b/modules/widgets/image-widget.php
@@ -229,13 +229,13 @@ public function form( $instance ) {
 			<p><label for="' . $this->get_field_id( 'img_url' ) . '">' . esc_html__( 'Image URL:', 'jetpack' ) . '
 			<input class="widefat" id="' . $this->get_field_id( 'img_url' ) . '" name="' . $this->get_field_name( 'img_url' ) . '" type="text" value="' . $img_url . '" />
 			</label></p>
-			<p><label for="' . $this->get_field_id( 'alt_text' ) . '">' . esc_html__( 'Alternate text:', 'jetpack' ) . '  <a href="http://support.wordpress.com/widgets/image-widget/#image-widget-alt-text" target="_blank">( ? )</a>
+			<p><label for="' . $this->get_field_id( 'alt_text' ) . '">' . esc_html__( 'Alternate text:', 'jetpack' ) . '  <a href="https://support.wordpress.com/widgets/image-widget/#image-widget-alt-text" target="_blank">( ? )</a>
 			<input class="widefat" id="' . $this->get_field_id( 'alt_text' ) . '" name="' . $this->get_field_name( 'alt_text' ) . '" type="text" value="' . $alt_text . '" />
 			</label></p>
-			<p><label for="' . $this->get_field_id( 'img_title' ) . '">' . esc_html__( 'Image title:', 'jetpack' ) . ' <a href="http://support.wordpress.com/widgets/image-widget/#image-widget-title" target="_blank">( ? )</a>
+			<p><label for="' . $this->get_field_id( 'img_title' ) . '">' . esc_html__( 'Image title:', 'jetpack' ) . ' <a href="https://support.wordpress.com/widgets/image-widget/#image-widget-title" target="_blank">( ? )</a>
 			<input class="widefat" id="' . $this->get_field_id( 'img_title' ) . '" name="' . $this->get_field_name( 'img_title' ) . '" type="text" value="' . $img_title . '" />
 			</label></p>
-			<p><label for="' . $this->get_field_id( 'caption' ) . '">' . esc_html__( 'Caption:', 'jetpack' ) . ' <a href="http://support.wordpress.com/widgets/image-widget/#image-widget-caption" target="_blank">( ? )</a>
+			<p><label for="' . $this->get_field_id( 'caption' ) . '">' . esc_html__( 'Caption:', 'jetpack' ) . ' <a href="https://support.wordpress.com/widgets/image-widget/#image-widget-caption" target="_blank">( ? )</a>
 			<textarea class="widefat" id="' . $this->get_field_id( 'caption' ) . '" name="' . $this->get_field_name( 'caption' ) . '" rows="2" cols="20">' . $caption . '</textarea>
 			</label></p>';
 
diff --git a/modules/widgets/milestone/milestone.php b/modules/widgets/milestone/milestone.php
index 49e7267fcc76b..2da5582bbdc35 100644
--- a/modules/widgets/milestone/milestone.php
+++ b/modules/widgets/milestone/milestone.php
@@ -4,7 +4,7 @@
 Description: Countdown to a specific date.
 Version: 1.0
 Author: Automattic Inc.
-Author URI: http://automattic.com/
+Author URI: https://automattic.com/
 License: GPLv2 or later
 */
 
@@ -533,7 +533,7 @@ function sanitize_range( $n, $floor, $ceil ) {
 	 * Sanitize an instance of this widget.
 	 *
 	 * Date ranges match the documentation for mktime in the php manual.
-	 * @see http://php.net/manual/en/function.mktime.php#refsect1-function.mktime-parameters
+	 * @see https://php.net/manual/en/function.mktime.php#refsect1-function.mktime-parameters
 	 *
 	 * @uses Milestone_Widget::sanitize_range().
 	 */
diff --git a/modules/widgets/top-posts.php b/modules/widgets/top-posts.php
index a4140e435d8cf..442dddd7b0be8 100644
--- a/modules/widgets/top-posts.php
+++ b/modules/widgets/top-posts.php
@@ -310,7 +310,7 @@ function widget( $args, $instance ) {
 		if ( ! $posts ) {
 			$link = 'https://jetpack.com/support/getting-more-views-and-traffic/';
 			if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
-				$link = 'http://en.support.wordpress.com/getting-more-site-traffic/';
+				$link = 'https://en.support.wordpress.com/getting-more-site-traffic/';
 			}
 
 			if ( current_user_can( 'edit_theme_options' ) ) {
diff --git a/modules/widgets/wordpress-post-widget.php b/modules/widgets/wordpress-post-widget.php
index f518ad6148ad6..fb9ffa7aeebef 100644
--- a/modules/widgets/wordpress-post-widget.php
+++ b/modules/widgets/wordpress-post-widget.php
@@ -4,7 +4,7 @@
  * Description: Displays recent posts from a WordPress.com or Jetpack-enabled self-hosted WordPress site.
  * Version: 1.0
  * Author: Brad Angelcyk, Kathryn Presner, Justin Shreve, Carolyn Sonnek
- * Author URI: http://automattic.com
+ * Author URI: https://automattic.com
  * License: GPL2
  */
 
diff --git a/sal/class.json-api-post-base.php b/sal/class.json-api-post-base.php
index 7577d991c25e9..50e77c19ee2f5 100644
--- a/sal/class.json-api-post-base.php
+++ b/sal/class.json-api-post-base.php
@@ -472,9 +472,9 @@ public function get_author() {
 		if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
 			$active_blog = get_active_blog_for_user( $user->ID );
 			$site_id     = $active_blog->blog_id;
-			$profile_URL = "http://en.gravatar.com/{$user->user_login}";
+			$profile_URL = "https://en.gravatar.com/{$user->user_login}";
 		} else {
-			$profile_URL = 'http://en.gravatar.com/' . md5( strtolower( trim( $user->user_email ) ) );
+			$profile_URL = 'https://en.gravatar.com/' . md5( strtolower( trim( $user->user_email ) ) );
 			$site_id     = -1;
 		}
 
diff --git a/sal/class.json-api-site-jetpack.php b/sal/class.json-api-site-jetpack.php
index c1cd02bccc3ab..102f6cd5181b1 100644
--- a/sal/class.json-api-site-jetpack.php
+++ b/sal/class.json-api-site-jetpack.php
@@ -121,7 +121,7 @@ function is_headstart_fresh() {
 	function allowed_file_types() {
 		$allowed_file_types = array();
 
-		// http://codex.wordpress.org/Uploading_Files
+		// https://codex.wordpress.org/Uploading_Files
 		$mime_types = get_allowed_mime_types();
 		foreach ( $mime_types as $type => $mime_type ) {
 			$extras = explode( '|', $type );
diff --git a/tests/php/modules/shortcodes/test-class.archiveorg.php b/tests/php/modules/shortcodes/test-class.archiveorg.php
index e477bd729fe77..a411dd1809f11 100644
--- a/tests/php/modules/shortcodes/test-class.archiveorg.php
+++ b/tests/php/modules/shortcodes/test-class.archiveorg.php
@@ -38,7 +38,7 @@ public function test_shortcode_single_element() {
 		$id = 'Wonderfu1958';
 		$content = "[archiveorg id='$id' width='600' height='300']";
 		$shortcode_content = do_shortcode( $content );
-		$this->assertContains( "iframe src='http://archive.org/embed/$id' width='600' height='300'", $shortcode_content );
+		$this->assertContains( "iframe src='https://archive.org/embed/$id' width='600' height='300'", $shortcode_content );
 	}
 
 	/**
@@ -50,6 +50,6 @@ public function test_shortcode_book() {
 		$id = 'goodytwoshoes00newyiala';
 		$content = "[archiveorg-book id='$id' width='600' height='300']";
 		$shortcode_content = do_shortcode( $content );
-		$this->assertContains( "iframe src='http://archive.org/stream/$id?ui=embed#mode/1up' width='600' height='300'", $shortcode_content );
+		$this->assertContains( "iframe src='https://archive.org/stream/$id?ui=embed#mode/1up' width='600' height='300'", $shortcode_content );
 	}
-}
\ No newline at end of file
+}
diff --git a/tools/export-translations.php b/tools/export-translations.php
index 71c4d3136be9c..3d4c1079dba62 100644
--- a/tools/export-translations.php
+++ b/tools/export-translations.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Exports translations from http://translate.wordpress.org/api/projects/jetpack
+ * Exports translations from https://translate.wordpress.org/api/projects/jetpack
  *
  * php export-translations.php DIRECTORY SOURCE_URL
  */
diff --git a/tools/import-translations.php b/tools/import-translations.php
index e06842655d544..7b670445e0074 100644
--- a/tools/import-translations.php
+++ b/tools/import-translations.php
@@ -63,7 +63,7 @@ function apize_url( $url ) {
 		$origin_urls[] = $origin_url;
 	}
 
-	$origin_urls[] = 'http://translate.wordpress.com/api/projects/wpcom';
+	$origin_urls[] = 'https://translate.wordpress.com/api/projects/wpcom';
 */
 	die_error( 'No SOURCE_URLs specified' );
 }