title: No auth function available for given request
body: <p>I'm a newbie to access with DropBox's Api (See: <a href="https://www.dropbox.com/developers-v1/core/docs#oauth2-methods">https://www.dropbox.com/developers-v1/core/docs#oauth2-methods</a>). Now there's a problem rocking me——</p>
  
  <p>1) I get an access_token successfully.
  2) I wanna see the user's detailled info by directly calling "<a href="https://api.dropboxapi.com/1/account/info">https://api.dropboxapi.com/1/account/info</a>". However the result is:</p>
  
  <pre><code>{"error_description": "No auth function available for given request", "error": "invalid_request"}
  </code></pre>
  
  <p>It seems that I should give the address something to make sure that I'm already authenticated. But how? I didn't see anything in Documents……? Any where?
  Thanks</p>