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Meta referrer: Difference between revisions
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Let '' | Let ''referrer-policy'' be the value of the <code>content</code> attribute with <code>LWS</code> stripped from the beginning and end of the string and converted to lower case. If ''referrer-policy'' is none of the strings listed above, the user agent MUST act as if ''referrer-policy'' is the string <code>default</code>. | ||
===Semantics=== | ===Semantics=== | ||
Revision as of 21:48, 25 October 2011
Overview
This document describes a proposal the "referrer" metadata name. Using the referrer metadata attribute, a document can control the behavior if the Referer HTTP header attached to requests that originate from the document.
Specification
Syntax
Keyword: referrer
The referrer metadata attribute can have one of four values:
neveralwaysorigindefault
Let referrer-policy be the value of the content attribute with LWS stripped from the beginning and end of the string and converted to lower case. If referrer-policy is none of the strings listed above, the user agent MUST act as if referrer-policy is the string default.
Semantics
If the directive is a string other than default, then Step 3 of Fetching resources in the HTML standard [HTML] is altered as follows:
never:
Examples
This meta element instructs the user agent to omit the Referer header in all HTTP requests that originate from the document containing the element:
<meta name="referrer" content="never">
This meta element instructs the user agent to include the document's origin in the Referer header rather than the full URL of the document.
<meta name="referrer" content="origin">