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Question

How can i debug HTTP sessions using Fiddler, just like i did with TcpView ?

Answer 1

+1 A:

Set Fiddler to listen on port 4747, and then edit your CustomRules.js (menu->Rules->Customize Rules). Putting something like this into the OnBeforeRequest method should help:

if (oSession.host=="localhost:4747") {
  oSession.host="external:1000";
}

if you want all traffic passing through Fiddler to go to the external host, you can simply use

oSession.host="external:1000";

(where external is the hostname of the external host)

Piskvor 2010-09-20 08:48:42

See also http://www.fiddler2.com/fiddler/dev/scriptsamples.asp for other useful snippets you can use in your CustomRules.

Piskvor 2010-09-20 08:51:22

thank you! that helped a lot!

Konoplianko 2010-09-20 09:05:08

@Konoplianko: You're welcome. Had a similar problem some time ago :) (Fiddler ROCKS!)

Piskvor 2010-09-20 09:12:08

I have another problem. now fiddler responses with its own content.

Konoplianko 2010-09-20 09:25:48

@Konoplianko: That should only happen when the target server is unreachable...

Piskvor 2010-09-20 09:28:29

i wrote in the script: oSession.host="10.233.103.53:10000"; but that means it doesnt works then.

Konoplianko 2010-09-20 09:29:53

@Konoplianko: Direct connection works?

Piskvor 2010-09-20 09:48:46

yes. directly it works good. seems that this script doesn't work.

Konoplianko 2010-09-20 10:16:43

The redirection script above would only happen if you typed "localhost:4747" into your browser. And that would never work in most browsers because they bypass the proxy for the "localhost" name. You should probably change your "if" condition such that it checks ONLY the port and not the hostname and port.

EricLaw -MSFT- 2010-09-26 21:16:25

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How can i debug HTTP sessions using Fiddler, just like i did with TcpView ?

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