title: Adobe Flash Builder 4: HTTP Service: What to return?
body: <p>I'm having trouble figuring out what my Flex Project is expecting from my PHP file in-relation to HTTP Service. Can anyone give a link or an example as to what the PHP file should return? I already configured the return type of the Operation to String. Then on my PHP file, I put in a simple line of code</p>
  
  <pre><code>&lt;?php
  echo "hello world";
  ?&gt;
  </code></pre>
  
  <p>but the problem is, whenever I try to test the Operation, Flash Builder keeps telling me <strong><em>InvocationTargetException:The response is not a valid XML or a JSON string</em></strong></p>
  
  <p>I want to see a working example of interactions between a Flex Project and an HTTP Service...</p>