Won't Fix
Last Updated: 25 Aug 2023 08:14 by ADMIN

Dear Fiddler developers,


I was recently inspecting the Punch In and Clock Out system of our company. After I captured the POST to send the punch in packages, I try to replayed it.

The replay functions returened a valid request. It is still valid even if I export the session into curl of a bat fil. But I got a issue after I copy the code into a bigger automatic code. The server I sent report me a 543 error "Please check the shifts." And the map API returned a UTF-8 wrong decode.


First I thought that this is because the limitation of both Unix and Windows system, I tried to pipe all the satings into the limitation they desire, 520 as I measured in UNIX. But it did not work.

Later on I watch the debug with the bash -x for about an hour, then I realise that you, the Fiddler program actually somehow turn one % into double %%.

After I replace all the %% with single %, everything works fine.


My first doubt is the ChatGPT. But as I was looking through the chat history, the ansewer is no, The problem is somewhere before I ever peate the code to ChatGPT to run. So I regenerated the whole cURL code from Fiddle, and yes this fault is your issue.


Please keep me updated if you fix that problems. Also, maybe I am ingnorant on this common problem. I am just a noob in the holy I.T. stuffs.



Won't Fix
Last Updated: 03 Dec 2020 14:42 by ADMIN
Created by: Poor
Comments: 1
Type: Bug Report

In the Good Old Times™ "give feednback" just mean "give feedback".

Well, here is your feedback.

Why do i have to

  • create an account I need like Aids
  • confirm the account  I need like Aids
  • set a password to an account I need like Aids
  • log in with said account I need like Aids
  • click the "report bug" button (finally)
  • getting interrupted again by some page who tries to trick me in a fucking search
  • find the "yes I really really want to report that bug" button
  • and finally after all the above being able to GIVE SOME FUCKING FEEDBACK?

Why are you wasting my time? I did not make it buggy, it was you!

Won't Fix
Last Updated: 05 Nov 2020 07:03 by Adam
Created by: Adam
Comments: 4
Type: Bug Report
We downloaded Fiddler Classic from our site for evaluation, and when we try to distribute it via Google Drive (we are enterprise subscribers), we get a virus warning, and the download is not allowed.

I'm guessing this is a false positive, but want to verify that with you, and see if you know why it might be flagged as virus by Google's scanning service.

We are holding off distributing or evaluating the product for now, erring on the side of caution.


Adam Creighton
Studio Head, Enduring Games
Won't Fix
Last Updated: 09 Dec 2019 15:11 by ADMIN
Created by: Girish
Comments: 1
Type: Bug Report

I am getting the following crash when trying to install Fiddler, please advise : 


 mono Fiddler.exe

WARNING: The Carbon driver has not been ported to 64bits, and very few parts of Windows.Forms will work properly, or at all



Native Crash Reporting


Got a SIGSEGV while executing native code. This usually indicates

a fatal error in the mono runtime or one of the native libraries 

used by your application.




Native stacktrace:


(No frames) 




Telemetry Dumper:


Pkilling 0x7000085df000 from 0x11617bdc0

Pkilling 0x7000088e8000 from 0x11617bdc0

Entering thread summarizer pause from 0x11617bdc0

Finished thread summarizer pause from 0x11617bdc0.


Waiting for dumping threads to resume



External Debugger Dump:


(lldb) command source -s 0 '/tmp/mono-gdb-commands.95325'

Executing commands in '/tmp/mono-gdb-commands.95325'.

(lldb) process attach --pid 95325

error: attach failed: Error 1



Basic Fault Address Reporting


Memory around native instruction pointer (0x7fff5ce3a565):0x7fff5ce3a555  53 50 48 89 fb 48 8b 05 af 51 f3 31 48 8b 48 18  SPH..H...Q.1H.H.

0x7fff5ce3a565  48 89 4f 18 48 8b 48 10 48 89 4f 10 48 8b 08 48  H.O.H.H.H.O.H..H

0x7fff5ce3a575  8b 40 08 48 89 47 08 48 89 0f 89 f7 48 89 de e8  .@.H.G.H....H...

0x7fff5ce3a585  52 e1 fb ff 48 89 d8 48 83 c4 08 5b 5d c3 55 48  R...H..H...[].UH



Managed Stacktrace:


  at <unknown> <0xffffffff>

  at System.Windows.Forms.XplatUICarbon:CGDisplayBounds <0x000bc>

  at System.Windows.Forms.XplatUICarbon:get_WorkingArea <0x00072>

  at System.Windows.Forms.XplatUICarbon:get_VirtualScreen <0x00043>

  at System.Windows.Forms.XplatUI:get_VirtualScreen <0x00048>

  at System.Windows.Forms.Screen:.cctor <0x0017a>

  at System.Object:runtime_invoke_void <0x000a5>

  at <unknown> <0xffffffff>

  at System.Windows.Forms.Form:get_CreateParams <0x0062a>

  at System.Windows.Forms.Control:CreateHandle <0x0009e>

  at System.Windows.Forms.Form:CreateHandle <0x00052>

  at System.Windows.Forms.Control:CreateControl <0x000c6>

  at System.Windows.Forms.Control:SetVisibleCore <0x00112>

  at System.Windows.Forms.Form:SetVisibleCore <0x0024a>

  at System.Windows.Forms.Control:set_Visible <0x00052>

  at System.Windows.Forms.Control:Show <0x00042>

  at System.Windows.Forms.Control:Show <0x000a2>

  at Fiddler.frmViewer:‹• <0x0028a>

  at Fiddler.frmViewer:‡• <0x000d2>

  at <Module>:runtime_invoke_void_object <0x000b0>


zsh: abort      mono Fiddler.exe