I have seen two different issues: (on Win10 and Win7)

a) Web browser throws a "site not trusted" error.

b) Fiddler does not decrypt, even though it is set to decrypt https

What is the path forward?

Thank you!

Hello everybody,

While using Fiddler on a specific website, I would like to edit the request sent by the website.

But the datas are sent through a .DAT file which I can't see the content.

In "value" input, Fiddler shows : "<file>" but I'm not able to open it (so edit it).

is there an add-on to do this or an option available in Fiddler to activate ?

thanks

So I am relatively new to http(s) debugging so be patient with me.  I am an .net app developer for my company.

The current situation is this; we have a website that we are wanting to use for training purposes.  We are primarily a Mac environment and this website does not seem to work on Safari.  It works on most browsers on the windows side.  I decided to do a trace using Fiddler, on my windows side, to see if I saw anything strange.

I am noticing a 404 error being thrown in the traffic.  The interesting thing is that all my browsers; IE and Chrome successfully bring up the website.

My question is how is this possible?  How do are these browsers getting around that error, that I am noticing in the Fiddler log, and successfully bringing up the website?

I am just wondering if this could be the issue as to why Safari cannot load the website.  Trying to understand why or how these other browsers are getting around that error.  The error is never thrown or displayed to the user.

Hello Forum,

I want to create REST requests.
Is it possible to connect to a web service that uses digest authentication?

Thanks

Kin

Hi:

Though this may not be necessarily a bug, yet I am still posting it here:

I am using the following 2 lines

sess.utilDecodeResponse();
sess.SaveResponseBody(@"a.bin")

I noticed that looks like the 2nd line would fail, at least, I can't find file "a.bin". Yet if change the parameter to @".\a.bin" then it would work.

Looks like this API doesn't accept a "bald" filename?

I am installing Fiddler 4.6.2.32002 with the /S switch, is there a switch to specify the destination folder?  Also, I am installing EnableLoopBack with the /S silent switch, but after the install is complete it opens EnableLoopBack app automatically.  Is there a way I can suppress the auto opening of the app when doing a silent install?

Windows 10 64bit version 1607 is the OS I am installing this on.

Thanks in advance,

Rich

I followed setup instructions, but am getting the following exception 

[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: An exception was thrown by the type initializer for System.Windows.Forms.WindowsFormsSynchronizationContext ---> System.TypeInitializationException: An exception was thrown by the type initializer for System.Windows.Forms.ThemeEngine ---> System.TypeInitializationException: An exception was thrown by the type initializer for System.Windows.Forms.ThemeWin32Classic ---> System.TypeInitializationException: An exception was thrown by the type initializer for System.Drawing.KnownColors ---> System.TypeInitializationException: An exception was thrown by the type initializer for System.Drawing.GDIPlus ---> System.DllNotFoundException: libgdiplus.dylib
  at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup (ulong&,System.Drawing.GdiplusStartupInput&,System.Drawing.GdiplusStartupOutput&)
  at System.Drawing.GDIPlus..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Drawing.KnownColors..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Drawing.Color.get_AliceBlue () [0x00000] in <filename unknown>:0 
  at Fiddler.CONFIG..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Windows.Forms.ThemeVisualStyles..ctor () [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ThemeEngine..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Windows.Forms.SystemInformation.get_MenuAccessKeysUnderlined () [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Control..ctor () [0x00000] in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control:.ctor ()
  at System.Windows.Forms.WindowsFormsSynchronizationContext..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Windows.Forms.Control..ctor () [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ScrollableControl..ctor () [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.ContainerControl..ctor () [0x00000] in <filename unknown>:0 
  at System.Windows.Forms.Form..ctor () [0x00000] in <filename unknown>:0 
  at ...ctor () [0x00000] in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) .:.ctor ()
  at Fiddler.frmViewer.‹• (System.String[] ˆ•) [0x00000] in <filename unknown>:0 
  at Fiddler.frmViewer.‡• (System.String[] ˆ•) [0x00000] in <filename unknown>:0 
exception inside UnhandledException handler: An exception was thrown by the type initializer for Fiddler.CONFIG

I get an error while loading fiddler (attached screenshot).

Could not find file "<install directory>/active.txt"

After I updated the latest Fiddler(Telerik Fiddler Web Debugger (v4.6.2.32002)) recently, thers is often a yellow bar with "The system proxy was changed..." shows on the top of the window, and stop capturing.

This happens really often, about per 15 seconds.

I used Process Monitor to find out which application has changed my system proxy, and find out the system proxy was disabled by Fiddler itself, as the picture attached.

Have anyone know the reason, and how can I fix it.

Thanks,

Donald

Hello!

I'm using Fiddler to validate the Google Analytics tag on my client's apps. Among other things, I need to validate the Screen Name of each screen in the app, but I can't find this information. Does anyone know how to find this information and would be willing to help me?

Thanks! :)