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    <p>W3C has <a href="http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader-method">this spec</a> about headers allowed by <code>setRequestHeader</code></p> <blockquote> <p>Terminate these steps if header is a case-insensitive match for one of the following headers:</p> <ul> <li>Accept-Charset </li> <li>Accept-Encoding </li> <li>Access-Control-Request-Headers</li> <li>Access-Control-Request-Method </li> <li>Connection </li> <li>Content-Length </li> <li>Cookie</li> <li>Cookie2 </li> <li>Content-Transfer-Encoding </li> <li>Date</li> <li>Expect</li> <li>Host </li> <li>Keep-Alive</li> <li>Origin</li> <li>Referer</li> <li>TE </li> <li>Trailer</li> <li>Transfer-Encoding </li> <li>Upgrade</li> <li>User-Agent </li> <li>Via</li> </ul> <p>… or if the start of header is a case-insensitive match for Proxy- or Sec- (including when header is just Proxy- or Sec-).</p> <p>The above headers are controlled by the user agent to let it control those aspects of transport. <strong>This guarantees data integrity to some extent.</strong> Header names starting with Sec- are not allowed to be set to allow new headers to be minted that are guaranteed not to come from XMLHttpRequest.</p> </blockquote> <p>Also you may consider:</p> <p>If header is not in the <a href="http://www.w3.org/TR/XMLHttpRequest/#author-request-headers">author-request-headers</a> list append header with its associated value to the list and terminate these steps.</p> <p>About browsers implementation, I've found this nice test: <a href="https://dvcs.w3.org/hg/webapps/diff/5814514eeba4/tests/XMLHttpRequest/setrequestheader-header-forbidden.htm">https://dvcs.w3.org/hg/webapps/diff/5814514eeba4/tests/XMLHttpRequest/setrequestheader-header-forbidden.htm</a> that you cant use to find current differences.</p> <p>For example, <strong>IE</strong> has this definition of security on headers:</p> <p><a href="http://msdn.microsoft.com/en-us/library/ms536752.aspx">IE</a>: Refer to <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html">RFC2616, Section 14</a>: Header Field Definitions for a general list of standard headers. The server is ultimately responsible for honoring the headers of the request. By far the most common request header is Content-Type, which is required by some XML Web services. </p>
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