Fiddler Ideas

Today, FiddlerCore sets the base path for writing (e.g. temp files generated when compressing/decompressing brotli, etc) to a "FiddlerCore" subfolder of the user's MyDocuments folder. This isn't a particularly good default, but the bigger problem ...

Observing session based authentication such as NTLM only works when the first WWW-Authenticate header in the 401 response is either either NTLM or Negotiate. For example, if I set up my server to send the headers in the following order: WWW-Authe...

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 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...

I develop a lot of extensions for Fiddler. Some of them are public, others are private to my organization. Currently Fiddler4 is built against the .NET Framework 4.0. I don't want my extensions to depend on a different version of the .NET Framewor...

Add collapse feature on syntax view and some more syntax highlighting (customizable ) i.e. different color for string,number, boolean values

https://groups.google.com/forum/#!topic/httpfiddler/cOGeilFbozY The request here is a trivial change, so that WebSocketMessage exposes a readonly oWebSocket property (e.g. get { return _wsOwner; } ) and WebSocket exposes a readonly oSession prop...

In the list of User-Agent strings there is very old Opera User-Agent. It is valid for old Presto based browser version <=12. All modern Opera browser versions 15+ (including v. 49 last stable version) should be present there instead or as an a...

Please support dpi scaling because it looks like shit.

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...