title: Instagram API Returning Invalid Format for Callback_Url Error
body: <p>I'm using the <a href="http://instagram.com/developer/api-console/" rel="nofollow">Instagram API</a>.</p>
  
  <p>I'm trying a simple post for a subscription request, and I keep getting </p>
  
  <blockquote>
    <p>"Invalid format for 'callback_url'. URL must start with http:// or
    https://".</p>
  </blockquote>
  
  <p>It clearly starts with that.</p>
  
  <p>I can't find anyone online that's running into this same problem. </p>
  
  <p>Tried the post with a clear callback url:</p>
  
  <pre><code>http://api.instagram.com/v1/subscriptions/?client_id={client_id}&amp;client_secret={secret}&amp;object=tag&amp;aspect=media&amp;object_id=skateboarding&amp;callback_url=http://skateparkoftampa.com/spot/instagram_callback.aspx
  </code></pre>
  
  <p>And with an HTML encoded callback <code>URL</code>:</p>
  
  <pre><code>http://api.instagram.com/v1/subscriptions/?client_id={client_id}&amp;client_secret={secret}&amp;object=tag&amp;aspect=media&amp;object_id=skateboarding&amp;callback_url=http%3A%2F%2Fskateparkoftampa.com%2Fspot%2Finstagram_callback.aspx
  </code></pre>
  
  <p>Also tried it with both GET and POST, also by letting the API console create the request by simply filling in the parameters fields, etc.  I feel like I'm missing something really obvious or something, but I'm stuck. Any ideas?</p>