title: Facebook app - login through omniauth - OAuthException 191
body: <p>I am facing with the problem:</p>
  
  <pre><code>  "error": {
        "message": "Invalid redirect_uri: Given URL is not allowed by the Application configuration.",
        "type": "OAuthException",
        "code": 191
     }
  </code></pre>
  
  <p>I set up in my app the needed keys and tokens, in the <a href="https://developers.facebook.com/apps/">Facebook's dev center</a> I set up <code>Site URL:</code> to <code>http://127.0.0.1:3001</code> and I am getting the error above. Also I tried to set up <code>App Namespace:</code> to <code>http://127.0.0.1:3001</code>, but I am getting error about bad address format...
  When I tried to fill out he <code>App Domain:</code> and set there my localhost, again the error for the bad format...</p>
  
  <p>What is the correct configuration the fabebook app with localhost?</p>