title: Tumblr OAuth Callback URL
body: <p>I'm setting the oauth_callback URL in the request header, when I do this in Twitter, it works fine and the user is redirected to the callback URL.  But using Tumblr's API, the callback URL is ignored and the user is redirected to the default URL.  Has anybody else experienced this?  Is there anywhere else other than the header that I should be setting this?  I tried passing it in as a parameter but that didn't really work either.</p>
  
  <p>Any help would be appreciated.</p>