Reverse Proxy and WCF with Fiddler in 30 seconds

ftom — Mon, 16 Feb 2009 17:04:54 GMT

In my current project I have to deal with a reverse proxy environment on production.

Unfortunately you can not debug your application on Production and usually there is no real reverse proxy testing environment available.

To test my WCF-Silverlight application I used Fiddler and custom rules to establish a decent test environment.

Goal:
To have a reverse proxy behaviour
from
http://mymachine:8888/Default.aspx
to
http://mymymachine:80/testApp/Default.aspx

To add these rules:
Fiddler -> Rules -> Custom Rules

Inside the Java Script function OnBeforeRequest(oSession: Session) add the following lines:

static function OnBeforeRequest(oSession: Session)
{
if (oSession.host.toLowerCase() == "myMachine:8888"){ oSession.host = "mymachine:80";}
if( !oSession.uriContains("testApp/")){ oSession.PathAndQuery = "/testApp" + oSession.PathAndQuery; }
…

Something interesting to note is the check for testApp.
If you always add the new URI part (what I first did) the MS Ajax engine gets confuesed and adds testApp/testApp to the Resources…

Finaly I can exactly see what my WCF Service sends to the server and where it goes wrong.

That’s it!
Tom