Hi guys, 
I am pretty new on Fiddler and Wireshark and stuff like that. I try to edit a response for learning propose but many connections dont get Shown on Fiddler.
Like that one : "https://prnt.sc/r9a7ms"

May I messed something up with my settings or do I need to make some Script to get it working?

Thanks for your time guys.

Hi,

 

I am trying to capture WebSocket connection of an app in windows (Win32).

I also created a test app with websocketsharp and connected to ws://echo.websocket.org and unfortunately this was not captured in fiddler.

Any help?

 

Fiddler version: v5.0.20194.41348 for .NET 4.6.1
Built: Thursday, October 3, 2019

I have a tuned fiddler. It great was working before today morning. 
I already had such a problem and it solved itself (i don't know how). I wasn't change settings, it just stopped decrypting.

---------------------------
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 cloud file provider is not running.



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

   at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)

   at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)

   at System.Xml.XmlTextReaderImpl.InitStreamInput(Uri baseUri, String baseUriStr, Stream stream, Byte[] bytes, Int32 byteCount, Encoding encoding)

   at System.Xml.XmlTextReaderImpl..ctor(String url, Stream input, XmlNameTable nt)

   at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)

   at Fiddler.XmlFileMimeMappings..ctor(String filePath) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\MimeMapping\XmlFileMimeMappings.cs:line 40

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 9784


Fiddler v5.0.20194.41348 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.18362.0] 
---------------------------
OK   
---------------------------

Hello,

I don't know if I can achieve this. Basically I wanted to send requests sequentially, if response of the request is 'true', I want fiddler to autoexecute/autorespond new request. Can this be achieved?

PC is connected in a company proxy.

Fiddler is already set to act as proxy and allow remote computers to connect.

---

Here are the current fiddler settings:

* Capture HTTPS CONNECTS (checked)

* Decrypt HTTPS traffic (checked)

* Fiddler listens on port: 8888

* Capture FTP requests (checked)

* Allow remote computers to connect (checked)

* Reuse client connections (checked)

* Reuse server connections (checked)

* Act as system proxy on startup (checked)

* Monitor all connections (checked)

* Use System Proxy (recommended) is selected

---

Proxy of external device is set to the following:

Proxy Server Address: <IP address of PC with Fiddler>

Port Number: 8888

---

 

Notes:

1. I was able to capture packets when PC OS was not Windows 10.

However, no packets were captured from the connected device when OS was changed to Windows 10.

2. External device and PC is under same network.

3. I have already read existing forums and fix does not apply on this issue.

 

---

How do I configure Fiddler to capture packets from external device?

Please, help me. How to send request in code Fiddler JavaScript.net?

Good day! I got problems with installation fiddler certificate on my pc, if I export the certificate myself, it simply is not detected by the system and google chrome says that the certificate is not valid, when I try to click install automatically using the trust root certificate button, it gives an error, put a log in the files. Thanks in advance.

I faced the next issue: Fiddler doesn't decode Zstandard (ZSTD) encoded requests!
Help me, please, how to fix it?

Hey Fiddler community,

I made an extension to cache API responses right in fiddler to speed up your front-end (or backend :)) development. Me and my teammates have been using this for a couple of years and we found it very useful. Its very handy if you work with rate limited APIs or heavy/slow network calls.

I thought of sharing this with the community, and it might help you if you are looking for something like this. Its in early stages and still needs improvements, testing and feedback. I would love to hear from you if you decide to give it a whirl. Bug reports or pull requests are very welcome.

Its called NitroCacher and here's the link: https://github.com/sarathkcm/NitroCacher .

 

To the Telerik team: it would be cool to get it added to the add-ons page. Would it be possible for you to add it there? Taking cues from another thread, I'm adding the required information below:

 

Header: Nitro Cacher

Screenshot: https://raw.githubusercontent.com/sarathkcm/NitroCacher/master/ScreenShots/ConfigureNitroCacher.PNG

Short Description: Fiddler add-on to cache API responses based on rules. Useful when working with rate limited APIs or heavy/slow API responses that take up a good amount of time during development.

Link: https://github.com/sarathkcm/NitroCacher