title: Flask-OAuth TypeError: Unicode-objects must be encoded before hashing
body: <p>I'm trying to use Flask-OAuth with Facebook following this <a href="https://github.com/mitsuhiko/flask-oauth/blob/master/example/facebook.py" rel="nofollow noreferrer">example</a>.
  I have define <strong>APP_ID</strong> and <strong>APP_SECRET</strong> according to mine.</p>
  
  <p>I can login with facebook account now, but when it redirects after login, I got this error:</p>
  
  <pre><code>TypeError: Unicode-objects must be encoded before hashing
  </code></pre>
  
  <p>According to the example code if there are no edited, the line of error was on line 48</p>
  
  <pre><code>me = facebook.get('/me')
  </code></pre>
  
  <p>So, what's wrong with that..?</p>