title: HTTP POST request sends 403 error. Invalid method signature
body: <p>Ok this is really frustrating. I'm using my API key perfectly fine. Authentication does just fine, token is generated fine, session key is also OK.</p>
  
  <p>But when I run the <a href="http://www.last.fm/api/show/playlist.create" rel="nofollow"><code>playlist.create</code></a>, the playlist is not created.</p>
  
  <p><em>Addendum (6 April 2013): It turned out I had to generate a new md5 hash for my sig, but even after doing so, the method does not work.</em></p>
  
  <p><em>Addendum 2 (9 April 2013): I started from almost scratch today, and redid most of my code. I created 16 playlists successfully, no errors. But today, the same code's not working. I didn't touch it at all and yet the error.</em></p>
  
  <p>nvm</p>
  
  <hr>
  
  <p>For security purposes, I cannot show you my security keys. However, I did write a quick program to find the last.fm session key: <a href="http://github.com/thekarangoel/LastFMSessionKeyFinder" rel="nofollow">http://github.com/thekarangoel/LastFMSessionKeyFinder</a> Simply register at last.fm/api, enter your API key and secret in the program and you'll have everything you need to test the API call.</p>