title: Is Asynchronous URLFetch App Engine's fastest way to send real-time messages to external systems?
body: <p>Is Asynchronous URLFetch the fastest mechanism to get out of the App Engine sandbox?</p>
  
  <p><a href="http://ikaisays.com/2010/06/29/using-asynchronous-urlfetch-on-java-app-engine/" rel="nofollow">http://ikaisays.com/2010/06/29/using-asynchronous-urlfetch-on-java-app-engine/</a></p>
  
  <p>We had experienced very slow URLFetches in the past, but think Pull Queues would introduce too much latency.</p>
  
  <p>Our Google App Engine app needs to send UDP messages in near real-time.
  Since App Engine supports only HTTP on port 80, we plan to use HTTP POST to EC2/Rackspace instances that in turn send the UDP message.</p>