title: Receiving and handling a GET request in PHP
body: <p>I'm trying to replace RSS polling with <a href="http://en.wikipedia.org/wiki/PubSubHubbub" rel="nofollow noreferrer">PubSubHubbub</a> on my site. I'm able to use the subscriber library that google offers to send the subscription request. From the code it looks like it sends a post request via cURL with the RSS URL and a callback URL.</p>
  
  <p>So this is where I need some direction:</p>
  
  <p>In order to complete the subscription request my callback URL has to receive a GET request and then echo back a value from the GET request along with a 200 response. How do I get the parameters from the GET request? Is the echo done again via cURL? If so what option should include the 200 response?</p>