I'm using Ruby on Rails on the server and needed to post JSON to it from Android. Here's some quick code that I wrote to do this. Hopefully it helps someone else. All of the tutorials that I found didn't work. You basically need to make sure you post data in JSON format. Just seetting parameters won't do the trick. In my case I had to create JSON something like: { fan: { email : 'foo@bar.com' } }