HTTP Referrer-Policy - new default value in spec #2792
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| Original file line number | Diff line number | Diff line change |
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@@ -13,7 +13,7 @@ | |
| --- | ||
| <div>{{HTTPSidebar}}</div> | ||
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| <p><span class="seoSummary">The <strong><code>Referrer-Policy</code></strong> {{glossary("HTTP header")}} controls how much <a href="/en-US/docs/Web/Security/Referer_header:_privacy_and_security_concerns">referrer information</a> (sent via the {{HTTPHeader("Referer")}} header) should be included with requests. Aside from the HTTP header, you can <a href="#integration_with_html">set this policy in HTML</a>.</span></p> | ||
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| <table class="properties"> | ||
| <tbody> | ||
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@@ -30,10 +30,6 @@ | |
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| <h2 id="Syntax">Syntax</h2> | ||
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| <pre class="brush: html">Referrer-Policy: no-referrer | ||
| Referrer-Policy: no-referrer-when-downgrade | ||
| Referrer-Policy: origin | ||
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@@ -44,30 +40,41 @@ <h2 id="Syntax">Syntax</h2> | |
| Referrer-Policy: unsafe-url | ||
| </pre> | ||
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| <div class="notecard note"> | ||
| <h4>Note</h4> | ||
| <p>The original header name {{HTTPHeader("Referer")}} is a misspelling of the word "referrer". The <code>Referrer-Policy</code> header does not share this misspelling.</p> | ||
| </div> | ||
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| <h2 id="Directives">Directives</h2> | ||
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| <dl> | ||
| <dt><code>no-referrer</code></dt> | ||
| <dd>The {{HTTPHeader("Referer")}} header will be omitted entirely. No referrer information is sent along with requests.</dd> | ||
| <dt><code>no-referrer-when-downgrade</code></dt> | ||
| <dd>Send the {{glossary("origin")}}, path, and querystring in {{HTTPHeader("Referer")}} when the protocol security level stays the same or improves (HTTP→HTTP, HTTP→HTTPS, HTTPS→HTTPS. Don't send the {{HTTPHeader("Referer")}} header for requests to less secure destinations (HTTPS→HTTP, HTTPS→file). | ||
| </dd> | ||
| <dt><code>origin</code></dt> | ||
| <dd>Send the {{glossary("origin")}} (only) in the {{HTTPHeader("Referer")}} header.<br> | ||
| For example, a document at <code>https://example.com/page.html</code> will send the referrer <code>https://example.com/</code>.</dd> | ||
| <dt><code>origin-when-cross-origin</code></dt> | ||
| <dd>Send the {{glossary("origin")}}, path, and query string when performing a {{glossary("Same-origin_policy", "same-origin")}} request to the same protocol level. Send origin (only) for cross origin requests and requests to less secure destinations.</dd> | ||
| <dt><code>same-origin</code></dt> | ||
| <dd>Send the {{glossary("origin")}}, path, and query string for {{glossary("Same-origin_policy", "same-origin")}} requests. Don't send the {{HTTPHeader("Referer")}} header for cross-origin requests.</dd> | ||
| <dt><code>strict-origin</code></dt> | ||
| <dd>Send the origin (only) when the protocol security level stays the same (HTTPS→HTTPS). Don't send the {{HTTPHeader("Referer")}} header to less secure destinations (HTTPS→HTTP).</dd> | ||
| <dt><a id="strict-origin-when-cross-origin"></a><code>strict-origin-when-cross-origin</code> (default)</dt> | ||
| <dd>Send the origin, path, and querystring when performing a same-origin request. For cross-origin requests send the origin (only) when the protocol security level stays same (HTTPS→HTTPS). Don't send the {{HTTPHeader("Referer")}} header to less secure destinations (HTTPS→HTTP). | ||
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| <div class="notecard note"> | ||
| <h4>Note</h4> | ||
| <p>This is the default policy if no policy is specified, or if the provided value is invalid (see spec revision <a href="https://github.com/whatwg/fetch/pull/1066">November 2020</a>). Previously the default was <code>no-referrer-when-downgrade</code>. </p> | ||
| </div> | ||
| </dd> | ||
| <dt><code>unsafe-url</code></dt> | ||
| <dd>Send the origin, path, and query string when performing any request, regardless of security. | ||
| <div class="notecard warning"> | ||
| <h4>Warning</h4> | ||
| <p>This policy will leak potentially-private information from HTTPS resource URLs to insecure origins. Carefully consider the impact of this setting.</p> | ||
| </div> | ||
| </dd> | ||
| </dl> | ||
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@@ -78,7 +85,7 @@ <h2 id="Integration_with_HTML">Integration with HTML</h2> | |
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| <pre class="brush: html"><meta name="referrer" content="origin"></pre> | ||
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| <p>Or set it for individual requests with <a href="/en-US/search?q=referrerPolicy">the <code>referrerpolicy</code> attribute</a> on {{HTMLElement("a")}}, {{HTMLElement("area")}}, {{HTMLElement("img")}}, {{HTMLElement("iframe")}}, {{HTMLElement("script")}}, or {{HTMLElement("link")}} elements:</p> | ||
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| <pre class="brush: html"><a href="http://example.com" referrerpolicy="origin"></pre> | ||
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@@ -87,16 +94,17 @@ <h2 id="Integration_with_HTML">Integration with HTML</h2> | |
| <pre class="brush: html"><a href="http://example.com" rel="noreferrer"></pre> | ||
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| <div class="notecard warning"> | ||
| <h4>Warning</h4> | ||
| <p>As seen above, the <code>noreferrer</code> link relation is written without a dash — <code>noreferrer</code>. When the referrer policy is specified for the entire document with a {{HTMLElement("meta")}} element, it's written <em>with</em> a dash: <code><meta name="referrer" content="no-referrer"></code>.</p> | ||
| </div> | ||
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| <h2 id="Integration_with_CSS">Integration with CSS</h2> | ||
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| <p>CSS can fetch resources referenced from stylesheets. These resources follow a referrer policy as well:</p> | ||
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| <ul> | ||
| <li>External CSS stylesheets use the default policy (<code>strict-origin-when-cross-origin</code>), unless it's overwritten via a <code>Referrer-Policy</code> HTTP header on the CSS stylesheet’s response.</li> | ||
| <li>For {{HTMLElement("style")}} elements or <a href="/en-US/docs/Web/API/ElementCSSInlineStyle/style"><code>style</code> attributes</a>, the owner document's referrer policy is used.</li> | ||
| </ul> | ||
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| <h2 id="Examples">Examples</h2> | ||
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@@ -232,25 +240,10 @@ <h2 id="Browser_compatibility">Browser compatibility</h2> | |
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| <p>{{Compat("http.headers.Referrer-Policy")}}</p> | ||
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There was a problem hiding this comment. Removed this note. Am attempting to move it into BCD - in discussion on precisely how here: mdn/browser-compat-data#9303 |
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| <h2 id="See_also">See also</h2> | ||
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| <ul> | ||
| <li><a href="/en-US/docs/Web/Security/Referer_header:_privacy_and_security_concerns">Web security > Referer header: privacy and security concerns</a></li> | ||
| <li>{{interwiki("wikipedia", "HTTP_referer", "HTTP referer on Wikipedia")}}</li> | ||
| <li>When using <a href="/en-US/docs/Web/API/Fetch_API">Fetch</a>: {{domxref("Request.referrerPolicy")}}</li> | ||
| <li>The obsolete <span style="white-space: nowrap;">{{HTTPHeader("Content-Security-Policy")}}</span> {{HTTPHeader("Content-Security-Policy/referrer", "referrer")}} {{Obsolete_Inline}} directive.</li> | ||
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FYI This is just one implication of referrer policies. Removed this and link to referer policy which covers what exactly happens.