Unplanned
Last Updated: 23 May 2022 06:51 by ADMIN

When there's a HAR file with h3 entries, they are either misinterpreted or ignored.

I know how to fix it both in the importer/exporter DLL and in Fiddler.exe.

I can submit a correction.

Unplanned
Last Updated: 21 Apr 2022 22:07 by Eric

Hello! The problem is described on this link: stackoverflow

 

 Please add in Filter -  feature block named "Request Body" with options "Show only if request body contains", "Hide only if request body contains"

Unplanned
Last Updated: 23 Mar 2022 06:25 by ADMIN

So far Fiddler says it can only import unencrypted sessions from PCAP files.

Various tools and libraries support the SSLKeylogfile environment variable and log the necessary keys.

You can either have them inside the pcapng file or in a seperate file.

It would be nice if Fiddler would accept an optional file with these keys and treated sessions with a suitable key as unencrypted.

This would make things a lot easier in the process.

Unplanned
Last Updated: 18 Jan 2022 06:53 by ADMIN

"Target Any Process" feature no longer working with Chrome. It used to work but no longer works specifically with Chrome. Still works with other processes. Capturing still works with Chrome as long as I am not using the "Target Any Process" feature.

Unplanned
Last Updated: 20 Dec 2021 15:35 by Eric
Created by: S
Comments: 2
Type: Feature Request
1

It would be highly useful if there was a "URL splitter" tool added, perhaps as a drop-down entry in the TextWizard, which takes a long-form paramaterized URL and splits it into a line-separated list of individual parameters (and can go the opposite way direction as well).

The "WebForms" subpanel already does this, albeit there's no manual ability to choose what URLs this can be done to ...as far as I'm aware.

Unplanned
Last Updated: 07 Dec 2021 10:46 by ADMIN
Scheduled for Fiddler for Windows vNext

Once a program has been "Filter now"ed via the context menu, if that filter is later deleted from down bottom, that program can no longer be "Filter Now"ed again; nothing happens.

It's as if program filtering is only given one opportunity to be "Filter Now"ed. Once that's happened, even if they filter gets deleted, the program isn't given another opportunity to be Filter Now'ed.

Unplanned
Last Updated: 23 Nov 2021 08:44 by ADMIN
Created by: Imported User
Comments: 5
Type: Feature Request
2
I've attached the raw HTTP response, copied directly from Fiddler. At lOperations[0].lRecords, you'll see that there are 2 records (arrays) and that each record contains 6 items, the last of which is an array. However, when I view the resonse using the JSON filter, the second of these arrays appears to contain only 5 items. I'm sure that the bug has something to do with the fact that the sub-array in the second array is an empty array, but it should display as an empty array, not as if it weren't there at all.
Unplanned
Last Updated: 17 Sep 2021 05:34 by ADMIN

Hi,

1-st of all, thanks for the Fiddler!

I'm using the custom font size set under the Fiddler options (Windows OS), but its not respected during the params editing.

see attached screenshot.

 

Unplanned
Last Updated: 04 Sep 2021 19:51 by Eric

I use the request LogRequests history to save requests, so that I can replay them when needed.  Every month or so when my machine is restarted for an update and if Fiddler is opened, the history is corrupted.  

I need a way to either save off certain requests like I can in Postman, etc, or I need Fiddler to have reliable restore points for the history so that the entire history is not corrupted so often.

Please fix or add a feature to address this -

Thanks

Unplanned
Last Updated: 13 Aug 2021 22:02 by Eric

HOSTS in fiddler shouldn't change SNI info when Decrypt HTTPS traffic is enabled

 

When Decrypt HTTPS traffic is enabled and use HOSTS in fiddler, SNI should be keep the same as request, instead of use the one from HOSTS(removed when use IP, or rewrite when use another HOSTS) 

Unplanned
Last Updated: 23 Jul 2021 14:09 by Andrew
Created by: Stephan
Comments: 6
Type: Feature Request
129
HTTP/2 has been a standard since mid-2015.   All major browsers support it,  but adoption is slow because there no good debugging tools.    I want to take advantage of pipelining, server push, etc that comes with HTTP/2 which makes it easier to adopt packages like gRPC.    Having a good debugging story (both capture as well as insertion / modification) would make this more possible
Unplanned
Last Updated: 02 Jun 2021 09:48 by ADMIN
Created by: Imported User
Comments: 2
Type: Feature Request
2
Allow to search / reuse requests from history in a more efficient way

1. Add column [Date] or [Date and Time] to history, so one can look for a request that was used at a given date / time

3. Allow to sort by request Url, date / time

4. Allow to group by request urls: If there are several requests with the same url, provide the option to group / ungroup them

5. Add column [Result] with the result code for each request, so that one can now which request to use (for example, one needs a request that gave a 404, or only 202s)

6. Filter history by request type (GET, PUT, ...), url content (example: search for "/admin/ ... etc"), date / time
Unplanned
Last Updated: 23 May 2021 00:10 by Eric

When my machine restarts before Fiddler is closed gracefully, Fiddler opens back up with an error saying that my capture saz is corrupt and cannot be opened.  
This is a pain as I have to then manually rebuild any requests that I need.

Fiddler should have savepoints or some way to prevent it from losing all my LogResuest history whenever Fiddler is forcefully shut down

Unplanned
Last Updated: 05 Apr 2021 06:36 by ADMIN
Created by: Eric
Comments: 0
Type: Bug Report
0

If you try to launch two instances of Fiddler/FiddlerViewer at the same time, you hit a sharing violation.

This file needs to be read with the correct sharing flags set.

---------------------------
Loading custom MIME mappings failed
---------------------------
Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

The process cannot access the file 'C:\Users\ericlaw\Documents\Fiddler2\CustomMimeMappings.xml' because it is being used by another process.

Type: System.IO.IOException
Source: mscorlib
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)

   at System.IO.FileStream..ctor(String path, FileMode mode)

   at Fiddler.XmlFileMimeMappings..ctor(String filePath) in C:\Jenkins\Fiddler_Windows\workspace\FiddlerCore\FiddlerCore.Shared\Common\Core\MimeMapping\XmlFileMimeMappings.cs:line 38

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Fiddler.Shared\Viewer.cs:line 9968


Fiddler v5.0.20202.18177 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.19043.0] 
---------------------------
OK   
---------------------------
Unplanned
Last Updated: 29 Mar 2021 14:57 by ADMIN
Since one of the last updates, Fiddler takes ages to start. Its in the range of Minutes on some machines. Can we please fix this?
Unplanned
Last Updated: 16 Mar 2021 07:06 by ADMIN

I recently am having an issue with MS Teams while running fiddler.  MS Teams keeps giving disconnect errors. That's when I noticed that fiddler it proxying it's traffic even though I have filters set to "Show only the following Hosts", and teams.microsoft.com are not included in the hosts.  I also notice other items in my sessions list that are not in my list of hosts so what is going on?

I don't really want to post my list of hosts publicly.  If you need them, please let me know and maybe I can email them to someone.

 

Unplanned
Last Updated: 11 Feb 2021 17:24 by trimpica

Please consider installing a desktop shortcut or start menu shortcut to launch Fiddler viewer (instead of fiddler to listen and capture traffic). This will help folk that want to review fiddler traces from others without launching Fiddler and interfering with locally running apps that misbehave due to Fiddler intercepting traffic by default on launch.

 

i realize I can create my own shortcut using "fiddler.exe -viewer". But I want to write troubleshooting guides to engineers that are new to both the technology they are learning and Fiddler/HTTP traffic analysis in general. Having two shortcuts created will make it easier to write instructions where we can advise folk to just launch shortcut to viewer to import a session or previously made fiddler saz file from someone else.

 

Thanks!

Unplanned
Last Updated: 11 Feb 2021 16:52 by Eric
Created by: Faris
Comments: 1
Type: Feature Request
0

I am using Fiddler for 6 months and I found it really nice and simple to understand and get the required information, but one feature in which fiddler is lacking is the NIC information although with fiddler we get the Source and destination IP, port, MIME type, TLS/SSL versions etc but if we get this NIC information it will be complete solution for Web debugging.

Regards,

 

Faris

Unplanned
Last Updated: 04 Dec 2020 13:57 by ADMIN
Created by: Ahsen
Comments: 4
Type: Bug Report
2

Hello,

I am getting the following error in fiddler and without Capture HTTPS CONNECTs it works, also in the Protocols I have enabled: <client>;ssl2;ssl3;tls1.0;tls1.1;tls1.2

fiddler.network.https> HTTPS handshake to <domain> (for #6) failed. System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted

Win32 (SChannel) Native Error Code: 0x80090326

Ashen

[Edited by Telerik Staff to remove personal information and convert to bug report]

Unplanned
Last Updated: 27 Nov 2020 10:06 by ADMIN

When I go to File | Save | All Sessions it defaults to a directory (that is not where I want to store the debug information I collected).  

I store all problems I am working on in a different directory structure.  When I go to SAVE my debug session I would like to set the Default directory (structure) where I save all my other documentation for problems I am working on.  Having to "re-find" my documentation folder multiple times in 20 minutes of saving multiple debug sessions is tedious and non-productive.

I suggest a user preference that has these options:

Set default directory to: ..........   (It will always open to here when a SAVE is done)

Follow Last SAVE directory:  (Check box)     This will open whatever directory location you last did a SAVE to

User Fiddler's Default Location:  (Check box)     This is like a "Reset" to Fiddler's default location.

 

 

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