title: Why is the first request to a Facebook IFrame App Canvas Page a POST request?
body: <p>I noticed when I set up my first FB app today (an iframe app accessed within facebook) that all the requests made to it via facebook are HTTP POSTs rather than GET requests. Is there any reason for this? What if I wanted to implement HTTP caching? </p>
  
  <p>I'm new to developing on the FB platform, forgive me if this is an obvious question but I've googled and can't find the answer. </p>