title: IdentityServer3 with WebAuthenticationBroker
body: <p>Has anyone used IdentityServer3 with WebAuthenticationBroker to implement  SSO in windows universal app (WUP)?</p>
  
  <p>For some reason the broker class decides to POST! to the STS at some point and it does not see the correct redirect (in the form of ms-app://sid#tokens) that is coming from STS.</p>
  
  <p>I can see in the fiddler traces that STS is indeed redirecting to the proper location in the last step:
  HTTP/1.1 302 Found
  Content-Length: 0
  Location: ms-app://s-1-15-2-38.../#code=0bdb86...&amp;id_token=eyJ0eX...&amp;access_token=eyJ0e...&amp;token_type=Bearer&amp;expires_in=7776000&amp;scope=openid%20offline_access%20email&amp;state=xyz&amp;session_state=367wnzhjdQ2r9TiX7sZmQ03y_kjBMKNVVwr6xfuByQ0.cd1e1d29ed153a7b4743bd0f51def6a3</p>