Marthinus G. Van Tonder

found a bug

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The type initializer for 'Fiddler.DNSResolver' threw an exception.

Type: System.TypeInitializationException
Source: Fiddler
at Fiddler.DNSResolver.ClearCache()

at Fiddler.Proxy.NetworkChange_NetworkAddressChanged(Object sender, EventArgs e)

System.NullReferenceException: Object reference not set to an instance of an object.

at Fiddler.DNSResolver..cctor()
Fiddler v4.4.9.1 (x64 AMD64) [.NET 4.0.30319.34011 on Microsoft Windows NT 6.3.9600.0]
Feedback by Marthinus G. Van Tonder Status: New Comments: 0 Last update: 2014-07-16T07:43:59 by Marthinus G. Van Tonder
Dustin Metzgar

WCAT postdata issue

When exporting to a WCAT script the "postdata" element for a request either needs to be written on the same line or in a separate file. What is produced now is multiline and the quotes are escaped but that doesn’t work with WCAT 6.3.
Problem by Dustin Metzgar Status: New Comments: 0 Last update: 2014-07-11T23:50:21 by Dustin Metzgar
Dustin Metzgar

WCAT secure element

When exporting to a WCAT script the “secure” element in a request does not get written with a trailing semicolon.
Problem by Dustin Metzgar Status: New Comments: 0 Last update: 2014-07-11T23:48:26 by Dustin Metzgar
Stephen Wick

AutoResponder Action Supports Matching Groups

When defining a Rule within the AutoResponder tab, is it possible to use matching groups from the Match form field within the Action field?

For example: If I want to respond to a request for with content from I would create a rule like the following. This rule would also apply to any other page under

Match: regex:http://maint\.mysite\.com/(.+)

Please forgive me if this is already possible. Just let me know how to do it.


I Love this product.
Idea by Stephen Wick Status: New Comments: 0 Last update: 2014-06-06T22:26:02 by Stephen Wick
Stephen Wick

Update the documentation for AutoResponders

Could you update the reference for AutoResponders in Fiddler?

As of v4.4.8.0 on 6/6/2014 I see that the following Actions are not documented:
- *ReplyWithTunnel
- *script:FiddlerScriptFunction
Feedback by Stephen Wick Status: New Comments: 0 Last update: 2014-06-06T22:18:33 by Stephen Wick
Andrey Tyurin

save capturing logs to tmp file

Hi, I need to run fiddler for a long time (about 10 hours) and would like to have possibility of saving output to some file during capturing. This will prevent RAM consumption by fiddler.
Feature Request by Andrey Tyurin Status: New Comments: 1 Last update: 2014-04-21T10:26:13 by Andrey Tyurin
Jacob Massey

bug fix

I was messing around with fiddler then i got this error message...
Also, what is
Problem by Jacob Massey Status: New Comments: 0 Last update: 2014-03-08T09:16:11 by Jacob Massey
Eric Hammes

Add IDs to timeline view

It is really hard to correlate the requests in the left panel to the corresponding timeline request in the timeline panel because they don't visually line up. The left panel has a nice ID column that numbers each request. Maybe show that ID in the Timeline panel too?
Feedback by Eric Hammes Status: New Comments: 1 Last update: 2014-03-03T16:47:37 by Eric Hammes
Raivis Kalinins

Add "range: bytes" header support

I set a file to be replaced with AutoResponder and then tried doing request with

Range: bytes=179200-

but it appears that Fiddler returns the whole file not the requested range.

If I disable auto responder then the file is requested from my nginx server which servers the file correctly. (only the bytes I requested)

Version: Fiddler Web Debugger (v4.4.5.9)
Feature Request by Raivis Kalinins Status: New Comments: 0 Last update: 2014-02-25T18:10:41 by Raivis Kalinins
Yan Mamoyko

Interception of .net application (wpf)

for example developing a WCF (WebAPI, SignalR) service and desktop application - the client. I would like to Fiddler could show http requests and responses between the client and server. For example it would help me!
Feature Request by Yan Mamoyko Status: New Comments: 1 Last update: 2014-01-28T23:00:41 by Eric Lawrence
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