When I try to check the body using the Fiddler Proxy on a particular website, I can find the body value in fiddler session list. But when I try to check body on Fiddler Script, the body value is checked as "".
I checked the session list that the body value is more than 260000 characters, but the Fiddler Script confirms it as 0 characters.

Here is example

This code contained in onBeforeResponse

```

var oBody = System.Text.Encoding.UTF8.GetString(oSession.responseBodyBytes);

```

And here is the url of that particular website.

https://m.cgv.co.kr/

I've using fiddler more than 1 years, but this is the first case of this phenomenon. I'd appreciate it if you could tell me how to do it

 

 

 

I have a user rinoing Windows 11 23h2 Fiddler everywherehas not been able to load past the splash screen.  I've tried cleanring the cashe, reinstall etc and  after several re-installs the Fiddler everywhere v5.18 wont load at all now.  Here are the details from the electron.log:

I'm not sure what the unhandled exception is referring to and you guidance would be greatly appreciated

2024-09-24 11:12:06:225] [info] [Product information] Fiddler Everywhere 5.17.0
[2024-09-24 11:12:06:230] [info] [System information] win32 (Windows_NT/x64) - version 10.0.22631
[2024-09-24 11:12:06:285] [info] Initializing splash screen.
[2024-09-24 11:12:06:488] [info] Ensure no running cleanup nodejs and cleanup .net processes.
[2024-09-24 11:12:06:774] [info] Displaying splash screen.
[2024-09-24 11:12:30:989] [error] Unhandled exception: TypeError: Cannot read properties of undefined (reading 'trim')
    at C:\Users\username\main.js:85:4480)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5)
[2024-09-24 11:20:26:463] [info] [Product information] Fiddler Everywhere 5.17.0
[2024-09-24 11:20:26:467] [info] [System information] win32 (Windows_NT/x64) - version 10.0.22631
[2024-09-24 11:20:26:524] [info] Initializing splash screen.
[2024-09-24 11:20:26:631] [info] Ensure no running cleanup nodejs and cleanup .net processes.
[2024-09-24 11:20:26:906] [info] Displaying splash screen.
[2024-09-24 11:20:45:287] [error] Unhandled exception: TypeError: Cannot read properties of undefined (reading 'trim')
    at C:\Users\username\main.js:85:4480)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5)
[2024-10-02 10:17:31:159] [info] [Product information] Fiddler Everywhere 5.17.0
[2024-10-02 10:17:31:164] [info] [System information] win32 (Windows_NT/x64) - version 10.0.22631
[2024-10-02 10:17:31:208] [info] Initializing splash screen.
[2024-10-02 10:17:31:306] [info] Ensure no running cleanup nodejs and cleanup .net processes.
[2024-10-02 10:17:31:657] [info] Displaying splash screen.
[2024-10-02 10:18:03:416] [error] Unhandled exception: TypeError: Cannot read properties of undefined (reading 'trim')
    at C:\Users\username\main.js:85:4480)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5)
[2024-10-02 12:21:09:225] [info] [Product information] Fiddler Everywhere 5.18.0
[2024-10-02 12:21:09:229] [info] [System information] win32 (Windows_NT/x64) - version 10.0.22631
[2024-10-02 12:21:09:296] [info] Initializing splash screen.
[2024-10-02 12:21:09:457] [info] Ensure no running cleanup nodejs and cleanup .net processes.
[2024-10-02 12:21:09:817] [info] Displaying splash screen.
[2024-10-02 12:21:40:602] [error] Unhandled exception: TypeError: Cannot read properties of undefined (reading 'trim')
    at C:\Users\username\main.js:85:4480)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5)
[2024-10-02 12:24:16:592] [info] [Product information] Fiddler Everywhere 5.18.0
[2024-10-02 12:24:16:595] [info] [System information] win32 (Windows_NT/x64) - version 10.0.22631
[2024-10-02 12:24:16:644] [info] Initializing splash screen.
[2024-10-02 12:24:16:777] [info] Ensure no running cleanup nodejs and cleanup .net processes.
[2024-10-02 12:24:16:988] [info] Displaying splash screen.
[2024-10-02 12:24:45:610] [error] Unhandled exception: TypeError: Cannot read properties of undefined (reading 'trim')
    at C:\Users\username\main.js:85:4480)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5)

can not find“System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089”

I am developing a Chrome extension that activates a proxy. When I enable the VPN and reload the page, the following steps should occur:

1. The Chrome browser makes a request to the proxy.
2. The proxy sends a response with a 407 code.
3. Chrome should call chrome.webRequest.onAuthRequired and provide credentials to the proxy.

However, I don't see any browser interactions with the proxy server.

Is it possible to observe the interaction between Chrome and the proxy using Fiddler?

Hello everyone,

I am trying to use a certificate that I have in the Windows Certificate Store with Fiddler.

In fact I am running the Fiddler in the server that is using the certificate in IIS.

I load the certificate to avoid fiddler certificate with the following code in Customize rules:

var certName: String = new String("servername")
var oCert: X509Certificate2 = CertMaker.FindCert(certName)
var result = false
MessageBox.Show(oCert)
result = CertMaker.StoreCert("servername", oCert);
MessageBox.Show(result)

 

In 4 line I show the certificate and it is correct.

In line 6 I verify that the certificate is loaded (true).

But if I try to access with the browser, fiddler show it is capturing an decrypting but with fiddler certificate (DO_NOT_TRUST_FiddlerRoot)

Can you help me to use the correct certificate installed in windows store?

I am trying to follow something like:

The CertEnroll Certificate Generator (telerik.com)

I have colleagues using with pfx file:

CertMaker.StoreCert("example.com", "C:\\temp\\cert.pfx", "TopSecretPassword");

but I want to use the other method:

CertMaker.StoreCert("example.com", certMyCert);

 

Any idea?

 

Thanks in advanced.

 

How can I decode a MessagePack of a certain websocket  ?

I tried to convert the hex to base64 then use an online msgpack converter to json but it didn't work.

I'm using Fiddler Everywhere.

(Attached an image)

Thank you !

Hi I can monitor the traffic of other applications with the iphone phone fiddler certificate. But Instagram traffic can't be tracked. How can i view instagram traffic via fidds.

I'm raising this inquiry to ask for the assistance who know familiar with Fiddler product.

About 9 months ago, in the end of year 2023, the issue occurred.
When a user accesses Web application with the latest Google Chrome, the blank screen (or WSOD) happened.
In order to analyze the cause of this issue, I've decided to install Fiddler to see how HTTP traffic was going about.
However, the issue has never occurred when Fiddler was running and I'm wondering why... 

Question#1: Why blank screen in browser never happens while Fidder is running?
Question#2: What's difference when Fiddler is running or not?

Fiddler Version: Progress Telerik Fiddler Classic v5.0.20211.51073

I'd really appreciate it if someone would help to answer this!

Regards,
Yamato

I'm seeking the difference of Operation System (Windows10)  parameters between when Fiddler is running and not.
The behavior of secure network traffics can change somehow, like proxy setting, while Fiddler is running.
If someone knows more about this, please give me an assistant. Thanks!

How to close or hide the snapshots pane? I have no use for it and it's taking screen real estate.