I have used FiddlerCore4.dll to capture the url. But I have the following problem that I don't understand why the error is.
I use fiddler capture request of a program. That program sends 2 urls. But the first url is captured by fiddler. The second url cannot be captured. I copied that 2nd url and pasted it in my web browser and fiddler caught it
Now how do I get the 2nd url from that software program to send?

I have sent a video of my test demo process. You can watch to understand the problem. At the same time, I have attached my 2 programs that I am testing in the video

Link Soft: https://drive.google.com/drive/folders/1nsDn71IQEsEw34Eev5BhdvqfrnrFpcSI

Link Video test: https://youtu.be/KaJ5UL2yq6w

Hello,

As soon as I start Fiddler, any attempt to connect to a secure web page fails with the message "Your connection is not private" in my web browser.

What's going on?

 Thanks

Hi,

I have been using HTTPS decryption in Windows Fiddler for years, to inspect the traffic to and from my app.
And it has been working perfectly on both my Samsung phone with Android 12 and my iPhone 6 Plus with iOS 12.5.5.

Recently I got an iPhone 11 with iOS 15.1, and find myself completely unable to get it to work 😢

Because I know, that requirements for certificates have been strengthened in recent versions of iOS, I have now ended up "resetting" the certificate in Fiddler and creating a new root certificate. I have successfully removed the old certificates and installed the new Fiddler certificate on both the Samsung and the iPhone 6 Plus, following the Capture Traffic from iOS Device guide, and everything works like a charm.

On the iPhone 11, I have also installed the certificate:

And I have enabled full trust for it:

And yet, if I try to visit e.g. https://google.com/ in Safari, I get an error message telling me that "This Connection Is Not Private":

And if I click "view the certificate", it shows that the google.com certificate, issued under the Fiddler root, is "Not Trusted" - with no indication as to why???

Hi

Because of the vulnerability found in the Log4j logging framework, the IT department in my company wants to know, if Fiddler is using Log4j?

.NET application show error message below when I close Fidler program on Windows Server (Production Environment)

System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:8888

If I open the Fidler program again, this error will be lost. I think this error occurred because the Filder does not roll back some settings after closing. So system still routes to 127.0.0.1:8888.

But after closing Fidler program I have checked the Internet option. It rollbacks properly (Use proxy server is unchecked).

Have other configuration that Fidler have changed? Or how to reset the proxy setting?

Currently, I work around by opening Filder program always.

Please help to solve this problem.

Hi there,

I have a browser application running on localhost:4200 (Angular) which is calling API methods on a remote host.

Using fiddler 4 I am intercepting the response and adding a cookie. I am also logging all the headers.

static function OnPeekAtResponseHeaders(oSession: Session) {
    oSession.oResponse.headers.Add("Set-Cookie","Test=MyCustomValue;");
    FiddlerObject.log(oSession.oResponse.headers);
}

In the logs I can see my Test cookie. I can also see a variety of other Set-Cookie headers being returned by the remote host.

However, none of them are being set in the browser, including my test cookie.

I have tried with different combinations of Domain, Path, SameSite, Secure etc, including removing these altogether, and I cannot get any cookies to be stored by the browser.

Any idea?

Hi, I use some VPN (Windows 10 x64) that works trough TAP-Windows Adapter V9, is there any way to capture traffic from process that proxied by this VPN? I tried turn on VPN then run Fiddler and when I run my Firefox with VPN on it I have an error in my Firefox:

Secure Connection Failed 

The connection to the server was reset while the page was loading.

Also tried add VPN url to Fiddler options > Connections > Bypass Fiddler for URLs that starts with. Still same issue is up.

So can I fix this somehow?

Im using fiddler every where V2.2.0, and this problem has been quite a while.

It's normal when i capturing data such as html/json/text(or it just too small to be noticed), but when it comes to image/video, fiddler every where will use up all memory very quickly, even if i didn't capture that huge amount of data. And there is no way avoid this, setting rules or click remove all doesn't help, the only solution is restart fiddler, which is annoying because in nearly 99% memory used, it's no possiable to do anything unless you want to wait several minutes for a simple file save location selecte window to pop up.

I've tried using the Rules(Do not capture/Graceful close/ Non graceful close), and it doesn't help.

Here's a screenshot when i capture tiktok's video info, taffic useage is only 50MB~, and data includes video/image/protobuf/json/html. With a time passed by, and some anaylize of thoes text body(no image nor video body), memory use 32GB.

What the h?