Fiddler Ideas

I use McAfee Web Gateway proxies that only support Kerberos authentication. When trying to use these devices as an upstream proxy fiddler first tries NTLMSSP and then NTLMSSP2 and then prompts for credentials. It never tries Kerberos in the reques...

ShellExecute("Fiddler") no longer works because Fiddler is no longer registered in the APP PATHS registry key. This breaks a 14-year-old mechanism of launching Fiddler. Incidentally, It appears that Fiddler now installs on a per-user basis /by de...

Not sure if this is a recent change, but I use Microsoft Outlook and Skype, and both are having connectivity issues when Fiddler is running. Also Windows 10 apps seem to be unable to have an internet connection as well.

This url invalid “Learn more at: http://fiddler2.com/r/?p3pinfo”

We've been using Fiddler to debug both iOS and Android apps for quite a while. Recently, some Apple devices have been automatically updated to version 10.3. Since then, we can't see any feed data in Fiddler. Does anyone else have the same issue? I...

I accept your update and get to the install part and Windows 10 tells me that the update has an invalid certificate (or something).

Please honor the option to disable capture. I use fiddler to test API development and I never want it to capture any other traffic. The configuration option to disable this doesn't work, please fix.

I was debugging a failing web request and it transpired that the HTTP response headers were corrupted, such that the content length field specified a length longer than the actual content. Hence fiddller was waiting for that extra content, and, a...

The Raw Inspectors try to avoid spewing a bunch of junk into the display if the MIME type is binary. But because of how the assignment happens today, switching sessions can temporarily cause a mixed state where the headers from a new (text) sessio...

Ensure that traffic from the Brave web browser is properly categorized by the traffic filtering system in the status bar.