Fix error when a sitemap path starts with //

When creating a Psr7 request with a base_uri set in the Client and a
path that starts with // (like '//wp-sitemap.xml'), the path is
interpreted as an absolute URL and we get a ClientException for
'unknown host: wp-sitemap.xml'. This is fixed by removing base_uri
from the client and always making Requests with the full url.

This was discovered while debugging #824 and may address that issue.

CHANGELOG.md

@@ -8,6 +8,7 @@
  - add ability to rewrite hosts specified on a new advanced options page @john-shaffer
   - as part of this, changed the host replacement function to use strtr instead of str_replace to avoid replacing things that we just replaced
  - add advanced option to skip URL rewriting @john-shaffer
+ - fix error when a sitemap path starts with // @jhatmaker, @john-shaffer
 
 ## WP2Static 7.1.7
 

src/DetectSitemapsURLs.php

@@ -39,7 +39,6 @@ public static function detect( string $wp_site_url ) : array {
 
         $client = new Client(
             [
-                'base_uri' => $base_uri,
                 'verify' => false,
                 'http_errors' => false,
                 'allow_redirects' => [
@@ -70,7 +69,7 @@ public static function detect( string $wp_site_url ) : array {
             }
         }
 
-        $request = new Request( 'GET', '/robots.txt', $headers );
+        $request = new Request( 'GET', $base_uri . '/robots.txt', $headers );
 
         $response = $client->send( $request );
 
@@ -106,7 +105,7 @@ public static function detect( string $wp_site_url ) : array {
                     $sitemap
                 );
 
-                $request = new Request( 'GET', $sitemap, $headers );
+                $request = new Request( 'GET', $base_uri . $sitemap, $headers );
 
                 $response = $client->send( $request );