title: Shibboleth SP3 HTTP Headers missing
body: <p>I am using shibboleth SP 3 and IIS 8 on one server. I protect a folder "secure" and redirects to a test ADFS, where I configured the extraction of the UPN from the AD.</p>
  
  <p>My attribute-map.xml looks like this:</p>
  
  <pre><code>&lt;Attributes xmlns="urn:mace:shibboleth:2.0:attribute-map" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt;
      &lt;Attribute name="http://schemas.xmlsoap.org/ws/2005/05/identity/claims/upn" id="UPN" /&gt;
  &lt;/Attributes&gt;
  </code></pre>
  
  <p>Everything works fine. I check the http headers and server variables, all the custom shibboleth headers are there and corresponding server variables with the prefix HTTP_</p>
  
  <p>I am deploying this on a test server, Windows Server 2012 with IIS 8. My problem is, I still have the server variables, but without the HTTP_ prefix, and I don't have the HTTP headers any longer, while my app relies on them.</p>
  
  <p>The configuration files are almost identical. I have dug in the Shibboleth SP wiki, which is a murder to read, I don't find where I can finetune how the attributes are added in HTTP headers or server variables.</p>
  
  <p>Do you have any clue?</p>
  
  <p>thanks.</p>