title: Apache and mod_proxy not handling HTTP 100-continue from client HTTP 417
body: <p>'m building some webby magic and am using Apache to front our tomcat server, forwarding requests to tomcat on port 8080. I have an issue using Apache and mod_proxy to forward requests. It appears the client (a web application) sends an HTTP 100-continue to which Apache responds with a 417 Expectation Failed.</p>
  
  <p>When I take Apache out of the picture and send requests directly to tomcat on port 8080, the request is successful and the client is sent a 200 OK.</p>
  
  <p>My Apache config looks like:</p>
  
  <p>
      ServerName abcproxy
      DocumentRoot /apps/apache-content/default</p>
  
  <pre><code>AddOutputFilterByType DEFLATE text/html text/plain text/css application/javascript text/xml
  
  BrowserMatch ^Mozilla/4 gzip-only-text/html
  BrowserMatch ^Mozilla/4\.0[678] no-gzip
  BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
  
  ExpiresActive on
  ExpiresDefault "access 0 seconds"
  
  ProxyPass / http://127.0.0.1:8080/
  ProxyPassReverse / http://127.0.0.1:8080/
  
          ProxyPreserveHost On
  
  CustomLog /apps/ocp-logs/apache/abcproxy.log combined
  </code></pre>
  
  <p></p>
  
  <p>Anyone see where i'm going wrong?</p>