title: Facebook Authentication and strange redirect behaviour
body: <p>I'm currently testing an OAuth implementation of facebook connect using <a href="http://facebooksdk.codeplex.com" rel="noreferrer">http://facebooksdk.codeplex.com</a>.</p>
  
  <p>I've got a FacebookController with 2 simple actions called <strong>LogOn</strong> and <strong>CallBack</strong>.</p>
  
  <p>Everything works fine and the user is logged correctly into my system.</p>
  
  <p>The problem is when the CallBack action is called, something strange happens that makes a simple</p>
  
  <pre><code>return Redirect(loggedUrl);
  </code></pre>
  
  <p>redirecting to the correct logged url but ending with the following characters: <code>#_=_</code></p>
  
  <p>It appears that the Facebook server sends the information to my webserver using the following HTTP header:</p>
  
  <pre><code>HTTP/1.1 302 Found
  Cache-Control: private, no-cache, no-store, must-revalidate
  Expires: Sat, 01 Jan 2000 00:00:00 GMT
  Location: http://mywebsite.com/Facebook/CallBack/?state=1&amp;code=AQCXexr10uxANSBOu9JqrBDxqPkWbsyxM1S9ltuY9XwCXW7eGsOII329SthClxOSM_a7wJvwrXh1_O3D5I7E_nxCDTWDLpyYdMpMUfw4zMWcQ4oV2PmRkIMd2NfPYRKlkLgkurEzka1CjAF1jp8Xb3crklOB59W4IT7LZy6MEmFusuhSKacmsTcV1LAOW4uJ3K4#_=_
  P3P: CP="Facebook does not have a P3P policy. Learn why here: http://fb.me/p3p"
  Pragma: no-cache
  Set-Cookie: locale=en_US; expires=Fri, 28-Oct-2011 00:09:38 GMT; path=/; domain=.facebook.com
  Content-Type: text/html; charset=utf-8
  X-FB-Server: 10.43.103.61
  X-Cnection: close
  Date: Fri, 21 Oct 2011 00:09:38 GMT
  Content-Length: 0
  </code></pre>
  
  <p>As you can see we can find the <code>#_=_</code> characters at the end of the <strong>Location</strong> value.</p>
  
  <p>It's like the Redirect was taking into account the <code>#_=_</code> characters by adding them automatically to the loggedUrl.</p>
  
  <p>Even when I try with <code>return Redirect("/");</code>, the <code>#_=_</code> is added from (almost) nowhere to my redirected url...</p>
  
  <p>Any idea would be really appreciated.</p>
  
  <p>Thanks in advance for any answer.</p>
  
  <p>Regards,</p>
  
  <p>LB</p>