title: OAuth & facebook access_token not working, need OAuth expert
body: <p>I have read the 1000+ blogs about how the redirect_uri has to be the same in both calls to OAuth in order to get a user token, but 100% of the time, regardless of how I format the URL, it fails with:</p>
  
  <pre><code>{
     "error": {
        "message": "Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request",
        "type": "OAuthException",
        "code": 100
     }
  }
  </code></pre>
  
  <p>I have been meticulous in making sure that the URLs in both calls were the exact same. My URL has to have a ? in it and I have tried replacing it with %3f but that didn't help. There has to be something else that can cause this error, I need to learn what that might be? </p>
  
  <p>This seemed to break for me over the past month sometime. We did a show in late July and things worked fine (had a different base URL for that show since it was a different server). Could it be that the URL is of this format:</p>
  
  <pre><code>someprestuff.morestuff.mainurl.com?prm=value
  </code></pre>
  
  <p>Are there too many "parts" to the URL for Facebook to accept it?</p>
  
  <p>I'm looking for alternate things to look for.</p>