Hi I am using Progress Telerik Fiddler Web Debugger version v5.0.20182.28034 for .NET 4.5 and I am unable to capture Https service wherein I can easily capture the HTTP traffic. The application for which I am capturing traffic is an ASP Dot net Core web application having version ASP.NET and Web Tools 2017 version 15.9.1 Microsoft Visual studio Enterprise 2017. I am facing issues in capturing Https traffic in spite of installing the root certificate and changing the system proxy for each protocol (HTTP, HTTPS, FTP) settings to 127.0.0.1:8888. Kindly help me with this.

Lots of development software has dark themes because it is less stress on your eyes and looks cool.

日志名称:          Application
来源:            .NET Runtime
日期:            2018/11/29 11:10:13
事件 ID:         1026
任务类别:          无
级别:            错误
关键字:           经典
用户:            暂缺
计算机:           AW
描述:
应用程序: Fiddler.exe
Framework 版本: v4.0.30319
说明: 由于未经处理的异常，进程终止。
异常信息: System.AccessViolationException
   在 System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr)
   在 System.Windows.Forms.NativeWindow.DefWndProc(System.Windows.Forms.Message ByRef)
   在 System.Windows.Forms.ToolTip.WndProc(System.Windows.Forms.Message ByRef)
   在 System.Windows.Forms.ToolTip+ToolTipNativeWindow.WndProc(System.Windows.Forms.Message ByRef)
   在 System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr)
   在 System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG ByRef)
   在 System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)
   在 System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
   在 System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
   在 Fiddler.frmViewer.‹•(System.String[])
   在 Fiddler.frmViewer.‡•(System.String[])


事件 Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name=".NET Runtime" />
    <EventID Qualifiers="0">1026</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2018-11-29T03:10:13.000000000Z" />
    <EventRecordID>217040</EventRecordID>
    <Channel>Application</Channel>
    <Computer>WYW46861.tcent.cn</Computer>
    <Security />
  </System>
  <EventData>
    <Data>应用程序: Fiddler.exe
Framework 版本: v4.0.30319
说明: 由于未经处理的异常，进程终止。
异常信息: System.AccessViolationException
   在 System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr)
   在 System.Windows.Forms.NativeWindow.DefWndProc(System.Windows.Forms.Message ByRef)
   在 System.Windows.Forms.ToolTip.WndProc(System.Windows.Forms.Message ByRef)
   在 System.Windows.Forms.ToolTip+ToolTipNativeWindow.WndProc(System.Windows.Forms.Message ByRef)
   在 System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr)
   在 System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG ByRef)
   在 System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)
   在 System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
   在 System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
   在 Fiddler.frmViewer.‹•(System.String[])
   在 Fiddler.frmViewer.‡•(System.String[])

</Data>
  </EventData>
</Event>

I find myself applying the same filters again and again on each launch of Fiddler (I mean the filters listed below the list of requests).

I think it would be really great if you could allow the restoration of previously applied filters (e.g. by having a save/load filters option).

Also, allowing to filter out by "Request Method" would be great too.

Congratulations on this tool, by the way.

It is really great. :)

Sometimes,I need to know response json node's count,but I can only paste it into the json editor to see the quantity.

Please check the pictures in the attachment.

I'm using Fiddler v4.6.20173.38786 (Built: Friday, September 15, 2017). When I click on the Customize Rules menu entry there is a message box that says "Unable to load Fiddler for code-completion support". After I click OK to that the Fiddler script editor will open normally.

Thanks for the note! P3P is now pretty much defunct (Windows 10 dropped it).

The redirector can be retargeted to the URL: https://web.archive.org/web/20080901012040/https://msdn.microsoft.com/en-us/library/ms537343.aspx#unsatisfactory_cookies

See https://fiddler.ideas.aha.io/ideas/FID-I-255

Fiddler swaps out the real proxy settings for localhost when in use. When you disconnect or close it, it restores the proxy settings. However, if the system crashes or power fails while Fiddler is in use, upon rebooting the real proxy settings are of course missing, they're still set to localhost. I would expect that if were to then run Fiddler, it would find those proxy settings again so that if I run Fiddler and close it again, my original proxy settings would be restored. Sadly this doesn't happen so in this scenario I have to manually set up my proxy settings again. Can this be implemented?

and all request from browsers are like this

In the black QuickExec box below the Web Sessions list, type:

prefs set fiddler.ui.rules.keeponly 123450

and hit Enter.

As a bug fix, Telerik should consider subscribing to changes in this value so that the toolbar UI updates with the "123450" number without restarting the tool.

Office365 capturing stops when access token expires, blocking office refresh token?

After 1 hour the access token expires and from that point on Outlook (office365) just starts getting 401 unauthorised responses and outlook stops working (don't get this when fiddler is not running). Other people on forum also saying they have seen the same issue.

I unchecked the "check for updates" box for a reason. It's just too much overhead and interrupts my productivity to have to stop and deal with an update before going and debugging the thing I'm working on. Even if the version is old, I'd rather just keep working than be interrupted.

Related: https://github.com/dotnet/corefx/issues/23177

Today, CONFIG.sDefaultBrowserExe and sDefaultBrowserParams are internal, default to Internet Explorer and they don't seem to be controlled by preferences.

There should be a preference like fiddler.ui.toolbar.BrowserList.Default and fiddler.ui.toolbar.BrowserListDefaultParams that allows override.

Not much more to say. Fiddler on Windows is absolutely awesome, but nothing comes close on Max OS X.

Please, please, please offer a native Mac OS X version. I'd hiply pay 4100 or more for it. I'd even pay that for an annual subscription.

In order to debug a website served on localhost by IIS Express you need to use localhost.fiddler to get traffic to show up in Fiddler, but if you use HTTPS you'll first get a warning that the certificate name does not match and you have to manually confirm this connection.

This is generally a good idea, but in the case of localhost and localhost.fiddler I think this warning should not be shown, as having to use localhost.fiddler is simply a technical restriction that Fiddler should know about...

See https://fiddler.ideas.aha.io/ideas/FID-I-369. Installing the new build (either from the website or the upgrade prompt) will fix this issue for you.

This is most likely a bug in either Windows, or a configuration problem in your environment. Does it still happen if you right-click Fiddler and Run As Administrator? Is there any text on Fiddler's LOG tab? If you try to change the system proxy settings manually to 127.0.0.1 port 8888 (In Fiddler, click Tools > Wininet Options > Connections > LAN Settings) do the changes "stick" after you hit OK and then reopen LAN Settings)?

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.