title: ajax problem - 200 OK in firebug but red message with no response body
body: <p>I have small ajax problem related to cross domain as i see it.</p>
  
  <p>On localmachine i created html example with some ajax:
  in registration text field user types 'username', 
  on every keystroke ajax sends it to 
  local Tomcat, where servlet checks if that username is already used
   and sends 'taken' reponse back.</p>
  
  <p>No problem on localhost at all. 
  As soon as i type used 'username' servlet sends 'taken' response 
  and browser displays it.</p>
  
  <p>But, when i put test html page with ajax
  on remote machine (some free hosting on remote network)
  that sends validation request on my localhost Tomcat,
  connection is made, 
  in Tomcat console i see request comming, 
  and in firebug in Mozzila this is Console ouput:</p>
  
  <pre><code>GET http://89.216.182.25:8080/Dinamicki1/UsernameServlet?username=zik 200 OK
  </code></pre>
  
  <p>...but in response tab 
  there is not servlet response 'taken' 
  and message in firebug is in red color</p>
  
  <p>So servers communicate well, no firewall problems, response is <code>200 OK</code><br>
  But response body is empty. </p>
  
  <p>Any ideas what this red messages in firebugs are?</p>
  
  <p>Thank you very much in advance.</p>
  
  <p>And if anyone can recommend a some serious ajax tutorial for java
  it will be highly appreciated :)</p>