Hi, I would like to report a bug in the Fiddler4.

I've attached a stack trace which is meaningful and sufficient in my opinion.

The issue was discovered over heavy usage of http post method.

 

Affected version: Telerik Fiddler Web Debugger (v4.6.3.44034) 64-bit AMD64

 

Regards,

Przemyslaw

I've used Fiddler sometime last year when Fiddler 2 existed. I decided the re download it for a project and was introduced to "Fiddler 4". Now with this new one there's a "read only" at the right bottom and I'm trying to figure out how can I disable that so I'll be able to use "break on response" etc 

Windows 7 SP1 x32 .NET 4.6

After installation and attempt to launch the Fiddler 4.5.1.6 I get this system message:

 

The version of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86 (32-bit) or x64 (64-bit) version of the program and then contact the software publisher.

 

What have I done wrong?​

I have been using Fiddler to debug some application https communication (from C# & C++ apps in Visual Studio, Java apps in Eclipse, and Android apps in the emulator).  I managed to enable Fiddler for all of those scenarios, but in retrospect I should have written down what I was doing each step of the way.

Now, I find that unless Fiddler is running my outlook won't connect.  Gah!  (All of my browsers work with or without Fiddler ... it just seems to affect Outlook)

I'd like to be able to access my email without starting Fiddler...

Hi,

I am trying to download a 206 response type content such as mp4.

I am able to use the below code. But when i try to open the file it says it got corrupted.

FiddlerApplication.BeforeResponse += delegate(Fiddler.Session oS)
            {
              if ((oS.responseCode == 200) && (oS.responseBodyBytes.Length > 1000))
              {
                string sMIME = oS.oResponse.MIMEType.ToLower();
                if (sMIME.StartsWith("audio/") ||
                    sMIME.StartsWith("video/") ||
                    sMIME.Contains("media"))
                {
                    oS.utilDecodeResponse();
                    oS.SaveResponseBody();                  
                }
              }
            };

Please help

 

Thanks,

Dhana

I'm trying to use Fiddler to modify response headers.  I am following instructions from  http://docs.telerik.com/fiddler/KnowledgeBase/FiddlerScript/ModifyRequestOrResponse, and the results look good in the Fiddler inspector.  However, when I look at what response is received in a browser debugger, it looks like it is getting the unmodified headers.

In OnBeforeResponse I have the following javascript:

oSession.oResponse["testHeader1"] = "test header 1 value";
oSession.oResponse.headers.Add("testHeader2", "test header 2 value");
oSession.oResponse["Content-Type"] = "modified content type";

It is adding new headers in two different ways and modifying an existing header.  In the attached screenshot you can see that in the Fiddler inspector the headers are modified as expected, but in the Chrome debugger the headers do not match (the headers that were supposed to be added are not there, and the modified header has it's original value).  I have also tried the same test with the Postman chrome add-on, and with Firefox, and they all show the same behaviour.

The Fiddler version is v4.6.20171.7553

I would welcome advice if I am making a silly mistake, but from my testing is appears to be an issue with Fiddler.  If you need any more information please let me know.

Thanks,
Alan

What exactly does it mean? "System Proxy"? is it the same as the proxy showed up in IE?

Will this affect my windows service running under system account?

Thanks

Hello Telerik, i'm encountering issue and the post of the title is self explanatory i added this code inside "OnBeforeRequest";

I didn't included all the headers it wasn't needed, the request itself is fine but the problem is that each of my variables are constantly re-initialized since it's inside OnBeforeRequest and i can't use anything like a "for" to loop.

What i need to do is to make a function that wait "https://testAPI.trylobby.info/online_1v1/start/" to be intercepted (HTTPS POST) this should read the Request body (room_id) send another request and "this" 4 times, i have try to create a new function but when i use var oSession = Fiddler.Session; it return me an error.

How can i simply use a damn "for" loop inside OnBeforeRequest without having my variable reset each time ? The thing is that i have more than 1 Client and it's kinda complex since it will receive more than 1 time the same request, while i also need to read the room_id each time the request is sent, if it's an already used id then don't send anything, for that i need to read the body of each request or make an array, but again the array is always "cleaned" due to the variable reset each time in the function so Hummm.

Any help would be appreciated, thank you and awesome software since years :) .

if(m_UseMSA) //This is a rule
        {
            var CurrentRoom = "";
            var UsedRoom = new Array;
            var i = 0;
            if(oSession.uriContains("https://testAPI.trylobby.info/online_1v1/start/"))
            {
                oSession.utilDecodeRequest();
                var Body = System.Text.Encoding.UTF8.GetString(oSession.requestBodyBytes);
                if(i<5)
                {
                    var BodyAsByte: byte[] = System.Text.Encoding.UTF8.GetBytes(Body);
                    var request: HTTPRequestHeaders = new HTTPRequestHeaders("/online_1on1/battle_start/",[Header1,Header2,Header3,Header4,Header5,Header6,Header7,Header8,Header9,Header10,Header11,Header12,'Content-Length: ' + Body.Length.ToString()]);
                    request.HTTPMethod = "POST";
                    request.UriScheme = "https";
                
                    var Dictionary = new System.Collections.Specialized.StringDictionary();
                    var newSession = FiddlerApplication.oProxy.SendRequestAndWait(request,BodyAsByte,Dictionary,null);
                    if(200 == newSession.responseCode)
                    {
                        i++;
                    }
                    
                }
                //FiddlerObject.alert(UsedRoom[0]);
            }
        }

 

Just a quick note that running "mono Fiddler.exe" (Fiddler 4.6.20171.14978; Linux Mint 18.1 32-bit; mono-complete installed; mono certificates synchronised) produces the following output on the command line:

can not parse as value of type 'i':
  ""
  ^^
can not parse as value of type 'i':
  ""
  ^^
The program itself seems to run fine, in my limited testing.

As a side note, is it possible that you could make the version number in the Help window selectable and copyable to make it easier to paste the version number here?

 

Hi,

I've got an application developped on Windows Mobile 6 and I would debug HTTP requests when I plug my device on my PC (in USB).
I have already tried to configure proxy (with "FIDDLERSERVER:8888") as indicated in this link : http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/MonitorPocketPC.

Is it possible to do this job with Fiddler? If so, say me how to do!

Best regards