title: HTTP Status Code 103 in Log
body: <p>We have a Tomcat 7 running behind an Apache2 Server, connected via AJP.</p>
  
  <p>Some AJAX-Requests we receive at the Tomcat do not contain any request Parameters.
  This applies to GET and to POST requests as well.
  Inspecting the Apache access_log the requests were all answered with a HTTP Status Code of 103:</p>
  
  <pre><code>IP - - [SNIP] "POST /redacted/ticket/1234567 HTTP/1.1" 103 655 "https://redactedhost.com/redacted/ticket/1234567" "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)"
  </code></pre>
  
  <p>I can't figure where this Status Code comes from. Has anybody ever heard of it? As far as I have examined it is not a Custom Response from our Application and it is not defined in our Tomcat or Apache configuration.</p>