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<a class="user-hover" rel="vtsji@idp.protectnetwork.org" id="email_vtsji@idp.protectnetwork.org" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=vtsji%40idp.protectnetwork.org" style="color:#326ca6;">vtsji@idp.protectnetwork.org</a>
created <img src="https://issues.shibboleth.net/jira/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SSPCPP-593'>SSPCPP-593</a>
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<a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SSPCPP-593'><strong>Unable to clear/overwrite response headers with ShibTargetApache::setResponseHeader</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://issues.shibboleth.net/jira/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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<a class="user-hover" rel="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#326ca6;">Scott Cantor</a>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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Web Server Modules </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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13/Aug/13 7:10 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>I'm implementing a custom handler in which I need to make a separate HTTP request to another system, and forward the results to the client after manipulating some of the response headers to ensure that they are correct.</p>
<p style='margin-top:0;margin-bottom:10px;'>Specifically, I want to overwrite the usual combo of Expires/Cache-Control/Pragma headers to prevent the client from caching the result.</p>
<p style='margin-top:0;margin-bottom:10px;'>For this, it would be handy to be able to use the following construct (pseudo-code):</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">
foreach (headers_in as header){
response.setResponseHeader(header.name, header.value);
}
response.setResponseHeader(<span class="code-quote">"Expires"</span>, <span class="code-quote">"..."</span>);
response.setResponseHeader(<span class="code-quote">"Cache-Control"</span>, <span class="code-quote">"..."</span>);
response.setResponseHeader(<span class="code-quote">"Pragma"</span>, <span class="code-quote">"..."</span>);
</pre>
</div></div>
<p style='margin-top:0;margin-bottom:10px;'>The problem with the <tt>ShibTargetApache</tt> implementation of <tt>setResponseHeader</tt> is twofold:</p>
<ul>
<li>The implementation uses <tt>ap_table_add</tt>, which does not allow you to the possibility of overwriting a previously set header. Maybe setResponseHeader could benefit from a third boolean <tt>replace</tt> argument, defaulting to false?</li>
</ul>
<ul>
<li>According to <tt>xmltooling::HTTPResponse::setResponseHeader</tt>, it should be possible to clear a header by passing nullptr for the <tt>value</tt> argument, but this currently segfaults (see also <a href="https://issues.shibboleth.net/jira/browse/CPPXT-97" title="Segfault in HTTPResponse::setResponseHeader when used to clear a header">CPPXT-97</a>). Even with the segfault out of the way, the current logic in ShibTargetApache does not remove a header when passed a nullptr for the value.</li>
</ul>
<p style='margin-top:0;margin-bottom:10px;'>I can work around the issue by filtering out the headers I want to overwrite in the for loop, but that's not a very elegant solution and is prone to code maintenance issues.</p>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#326ca6;" href="https://issues.shibboleth.net/jira/browse/SSPCPP">Shibboleth SP - C++</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://issues.shibboleth.net/jira/images/icons/priorities/minor.png" height="16" width="16" border="0" align="absmiddle" alt="Minor"> Minor
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<a class="user-hover" rel="vtsji@idp.protectnetwork.org" id="email_vtsji@idp.protectnetwork.org" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=vtsji%40idp.protectnetwork.org" style="color:#326ca6;">vtsji@idp.protectnetwork.org</a>
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