It would be really great to be able to view requests and responses as a formatted json string. Currently, you can show JSON, which uses some tree format, and you can show raw, which is just a flat hard to use string.
It would also be great to be able to format json inside the request composer so it can be easy to modify.
I have a connectivity issue when I run Fiddler (Progress Telerik Fiddler Web Debugger). I work behind a corporate proxy server and the server IP is changed every few hours. The change in IP is normally okay, but when I am running Fiddler with the 'Automatically Authenticate' option enabled, then Fiddler shows an error every time the proxy is changed; it shows a yellow error message suggesting "The system proxy was changed. Click to reenable capturing".
Clicking on the error in Fiddler works fine and it reconnects, but I find this frustrating because if i don't realise there was an error in fiddler and don't click it immediately then it affects my connectivity and some activities on my pc start to fail without me realising.
My suggestion is that you should let Fiddler auto-reconnect when this type of proxy change happens and when the 'Automatically Authenticate' option is enabled. I know it can't try to reconnect forever because it will cause an endless cycle for other people who have other types of proxy disconnects, but in my case it would be very helpful to let fiddler at least try once to auto reconnect (for me 1 retry is usually fine and Fiddler is able to connect to the new proxy address, but perhaps you can let the number of retries be a menu option so that users can set the number of retries that they want Fiddler to do after there was a proxy change or proxy error).
Thanks so much for your work, I really like Fiddler!
I hope you can bug fix this or add it as a feature, it will be very helpful!
I find having Capture on when you start Fiddler a pain since almost always one of the first things I have to do is turn it off. I'd like the option to just have it off on startup.
When Fiddler generates a certificate based on the original server certificate (using oSession["X-UseCertCNFromServer"]), it doesn't include all ServerAltNames from the original certificate.
1. Inspect a websocket connections traffic
2. Expand the preview column so that the message body should show more than 65 characters.
3. Observe that even though the column is wide enough to support more than 65 characters, only 65 characters are displayed.
WebSockets offer a mechanism for doing compression of messages. Fiddler's WebSocket Inspector should provide a simpler means of viewing such content. The mechanism looks to be a simple DEFLATE operation: https://tools.ietf.org/html/rfc7692
Fiddler does not set up it's proxy server for the websocket protocol. Applications looking at the global proxy settings are told by WebRequest.DefaultWebProxy.IsBypassed(Uri) that no proxy server should be used for the specified wss Uri.
1. Have a .NET application that uses websockets and checks WebRequest.DefaultWebProxy.IsBypassed(Uri) to see if a proxy should be used for a wss Uri.
2. Try to use Fiddler to observe websocket traffic
After turning on fiddler, enable "Use the same proxy server for all protocols" in the Internet Options / Advanced Proxy settings screen.
Steps to reproduce:
Version: 5.0.20192.25091 (2019-06-04)
Platform: Windows 10 build 17134, .NET 4.7.1
A simple change request: when I navigate, using Fiddler, to a page that has an untrusted https certificate, I get the popup from Fiddler warning me of the same. I want to get this popup, I don't want to disable it. However, when I click "Yes" on the popup, the main Fiddler window is brought into front, on top of my browser. My environment has a lot of self signed certificates in use on non-production systems, so this is happening quite often.
I propose the popup should work as now, but clicking on the popup should not bring the main Fiddler window up, in case it was minimized or under other windows.
Thanks a lot for your great work on the program.
Fiddler is great but the composer tab really needs some love. For example, it could do with text manipulation features from other applications - double click selects a chunk of text, but it doesn't appear to be aware of common symbols like : ? # " ' ; etc, instead it highlights up to the next space. If i were to do this in vs code or notepad++ it would be more intelligent about delimiters and highlight the portion before the : or inside the " ".
Pressing tab inside the editors moves to the next editor - this seems counter intuitive in this context as you'd expect the editor to insert a tab rather than move you to another field.
I've been using fiddler for years and this has always bugged me. I normally edit the request in another application and paste it in, but it'd be great if i could do some basic editing in fiddler itself. It shouldn't be full ide-mode, but a little bit of help would be appreciated.
Simple things that would make this much better:
It's incredibly an annoying prompt that occurs every. single. time. i open up fiddler.
Check for updates behind the scenes if an update exists and only let me know when an update exists
Running into more and more issues where the end user are authenticating via a smartcard. If the issue is after the initial handshake then we may be able to turn on Fiddler after the authentication and everything is okay. If the issue is specifically to do with the authentication or authentication screens then we are stuck and have no tool to use to debug the issue, especially when it may involve multiple processes.
With appropriate new settings in the Fiddler Options, could the socket connection on a TLS send certificate challenge call the appropriate API to use the SmartCard reader as well as challenge for a pin/biometric instead of reading from a certificate.cer file?
My windows DPI scaling is set to 200%, as my resolutions to 2000x3000.
If I load fiddler normally, I see the following blurry text.
So i saw this bug report, https://feedback.telerik.com/fiddler/1361354-hope-the-fiddler-can-support-the-high-dpi-screen which suggested to load up fiddler with -dpiaware, and now some text is better, but most of the tabs and buttons are incorrect sizes in the composer. In my opinion its more usable with the blurry text. I also tried to change the Fiddler.exe.config - EnableWindowsFormsHighDpiAutoResizing from true to false, but the only affect this had was to change the size of the mouse cursor.
Any ideas on something else to try, or is this a limitation of Fiddler / .Net WinForms.
Websocket monitoring is such a cool feature in fiddler. What i´m missing is the possibility to export all messages sent and received via the websocket.
In Wireshark i would associate that functionality with "Follow TCP stream".
The reason behind:
I want to search within the websocket communication for certain id´s patterns etc. This is currently not possible as every message is handled separately in fiddler.
What i would expect:
Beeing able to export selected or all messages in the WebSocket pane. (one could think of adding "received","sent" and a timestamp between the messages with a certain beginning to be able to filter those messages later.)
I would call the fact that:
- "Save" - "Selected Sessions" "as Text or ZIP" is only saving the websocket HTTP upgrade request together with the response but without the websockets payload
Or i am missing something. Comments welcome...