Questions on Fiddler Forum

1 answer

1.7K+ views

Hi All,

I am using Fiddler4.4.9.4.I am accessing a java application and can see http logs in fiddler. On hitting the application url in the browser(IE), I can see 404 error in fiddler for the following url:

/webroot/servlet/

Is there a way I can restrict this url from getting logged in fiddler using web.xml or some other setting.

In general, is there a way to restrict 404 error in fiddler using java code?

The application runs fine and there is no issue with this error in fiddler.Still,I need to remove this 404 error from fidder.Its a business requirement.

I tried googling aboult but did not find any thing suitable.

Any help is highly appreciated.Thanks in advance.

Fiddler Classic

answered on 24 Apr 2015

2 answers

333 views

unable to remove WinPcap after installing Fiddler

I am trying to install WireShark on my Windows 7X64 Ultimate machine, and the installer says WinPcap is already installed on my machine. The only thing I can find related to WinPcap on my machine is the npf.sys driver in the Window's 32 driver folder. I think Fiddler installed the build of WinPcap I have on my machine. I believe WireShark uses a more recent build of WinPcap so I would like to install the build of WinPcap that WireShark uses. How do I remove the build of WinPcap that Fiddler installed on my machine? I tried uninstalling Fiddler, and that did not work. WinPcap is not listed in Program/uninstall a program. Packet.dll is not in the System 32 folder; it's only in the SysWOW64 Folder. Also will the most recent build of fiddler work with the build of WinPcap that WireShark uses? I think WireShark uses a more recent build of WinPcap.

Windows

answered on 23 Apr 2015

1 answer

91 views

Fiddler captures "/ui-event-handler" continuously!!

What am I doing wrong?

Fiddler captures "/ui-event-handler" continuously!!

I cannot capture anything else.

See the attached file for a screenshot.

How is this solved? (fiddler used to work before)

Fiddler Classic

answered on 23 Apr 2015

1 answer

222 views

Fiddler for library that doesn't support proxy

Hello,

I'm using node.js and its library supertest/superagent for testing. The odd thing is that there isn't by default support for proxies.

I'm thinking of way to view headers in Fiddler. Both client and server are locally to my computer. And I have control of request URL.

Can you think of solution? Is it possible for Fiddler to change the port in the request?

Client -> Fiddler port 8888 -> (change request port to 3000) -> localhost:3000 server

Thanks

Fiddler Classic

answered on 20 Apr 2015

1 answer

3.5K+ views

Can Fiddler retrieve certificate properties

Hi,

This may be really obvious question and I am just missing something, but I was wondering can Fiddler retrieve a HTTPS sites certificate details?

For example when I go to gmail, can Fiddler retrieve the "issued by" or "issued to" certificate information (or even the likes of expiry date)? I am guessing that if Fiddler is set to decrypt HTTPS traffic it wont be able to as the site uses Fiddlers own certificate? So maybe this is impossible, just curious...

ie something like- oSession["https-Client-Certificate"].issuedto (which in gmails case would return "*.google.com")

Hope that makes sense!

Many thanks,

Ian

Windows

answered on 16 Apr 2015

1 answer

4.6K+ views

Configure Fiddler to show sites that use non default ports

Hi,

I was wondering if it is possible to configure Fiddler to show...

1. Sites that use non default ports (ignore 80 and 443).

2. Sites that bypass a proxy server by going direct.

Our environment uses a PAC file to direct internet traffic to our PROXY server. Occasionally we find web sites that do not use ports 80 or 443 (and may not be obvious from the URL). Also we sometimes find sites that do not forward traffic to the proxy server and still attempts to access the remote server directly.

Can Fiddler be used to help identify these scenarios?

Windows

answered on 15 Apr 2015

6 answers

352 views

FiddlerCore SSL was working, now isn't!

Up until Monday 6th my code worked. It simply uses FiddlerCore to monitor the widgets Websocket connection and enqueue the data frames text. Later I process that text to get the "Option" price/times I want. There used to be a constant stream of OnWebSocketMessage calls but now there are none from the Websocket! Only a couple for html/gfx at the start. I can see the same data I used to get in the propper Fiddler app so know the certificates are there and working. But no longer in my app. It seems I'm doing something wrong and it was a fluke it worked before? Or SSL was not used but now is after they updated? Please help!

01.//certmaker.exe is in debug dir

02.//see Log_OnLogString for output

03.

04.//App.xaml.cs

05.using Fiddler;

06.public partial class App : Application

07.{

08. protected override void OnStartup(StartupEventArgs e)

09. {

10. //Setup internal proxy

11. FiddlerCoreStartupFlags oFCSF = FiddlerCoreStartupFlags.Default;

12. oFCSF = (oFCSF & ~FiddlerCoreStartupFlags.RegisterAsSystemProxy);

13. FiddlerApplication.Startup(0, oFCSF);

14. base.OnStartup(e);

15. }

16. protected override void OnExit(ExitEventArgs e)

17. {

18. FiddlerApplication.Shutdown();

19. base.OnExit(e);

20. }

21.}

22.

23.//MainWindow.xaml.cs

24.using Fiddler;

25.using Awesomium.Core;

26.using Awesomium.Windows.Controls;

27.using System.Collections.Concurrent;

28.

29.public partial class MainWindow : Window

30.{

31. WebControl AweWebControl;

32. ConcurrentQueue<string> CQFiddlerPayloads;

33. public MainWindow()

34. {

35. CQFiddlerPayloads = new ConcurrentQueue<string>();

36.

37. FiddlerApplication.OnWebSocketMessage += FiddlerApplication_OnWebSocketMessage;

38. FiddlerApplication.Log.OnLogString += Log_OnLogString;

39.

40. WebCore.Initialize(new WebConfig

41. {

42. UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36"

43. });

44. WebPreferences prefs = new WebPreferences()

45. {

46. ProxyConfig = "http://127.0.0.1:" + FiddlerApplication.oProxy.ListenPort.ToString(),

47. };

48. WebSession webSession = WebCore.CreateWebSession(prefs);

49. AweWebControl = new WebControl();

50. AweWebControl.WebSession = webSession;

51. AweWebControl.CertificateError += AweWebControl_CertificateError;

52.

53. InitializeComponent();

54.

55. GridAweBrowser.Children.Add(AweWebControl);

56. AweWebControl.Source = new Uri("https://binguest.optiontime.com/binGuest/GuestMode.jsp?vendor=option-time&lang=en#classic");

57.

58. //create DispatcherTimer to process CQFiddlerPayloads

59. }

60.

61. string LogString = "";

62. void Log_OnLogString(object sender, LogEventArgs e)

63. {

64. LogString += e.LogString + "\n";

65. // /Fiddler.CertMaker> Using Fiddler.DefaultCertificateProvider+MakeCertEngine for certificate generation

66. // [WebSocket #20] Read from Server failed... Object reference not set to an instance of an object. <<not always!

67. // [WebSocket #20] Read from Client returned error: 0

68. // [WebSocket #20] Read from Server returned error: 0

69. }

70.

71. void FiddlerApplication_OnWebSocketMessage(object sender, WebSocketMessageEventArgs e)

72. {

73. if (e.oWSM.FrameType == WebSocketFrameTypes.Text && e.oWSM.IsFinalFrame == true)

74. CQFiddlerPayloads.Enqueue(e.oWSM.PayloadAsString());

75. }

76.

77. void AweWebControl_CertificateError(object sender, CertificateErrorEventArgs e)

78. {

79. e.Handled = EventHandling.Modal;

80. e.Ignore = true;

81. }

82.}

Windows

answered on 15 Apr 2015

3 answers

1.1K+ views

AutoRepsonse Fiddler only for GET

Hey,

in Fiddler 1 it was possible to add "Filters" in order to replace stuff in Requests / Responses. Sadly Fiddler 2 use a weird Script Tool now, which is not more "Noob Friendly"

So I tried AutoRepsonse. Sadly AutoRepsonse respond to all of the REquest Matching this. But for me it it is like:

HEAD /quest here/

GET /here he get the actual XML File/

HEAD /

So I want, that he only respond at GET (a Local File or a modded one)

What I real want is, modify a XML Response.

< file="/url/" version="50150"> I want: remove "Version=50150" so it looks like : <file="/url/">

Fiddler Classic

answered on 13 Apr 2015

2 answers

334 views

Use FiddlerCore as a forward proxy to replace Squid

Hi,

Does it make sense, and has it been used in the past, to use FiddlerCore as a forward proxy instead of using a Squid on Linux.

The primary reason for this would be lack of knowledge (and talent pool on C++ and Linux), and some other limitations with the Squid server.

Basically I would like to know if FiddlerCore has been designed to handle the load in production environment where 1000's of people will connect and use the proxy server primarily for content filtering and manipulation.

Any pointers would be greatly appreciated.

Regards,

Shloma

FiddlerCore

answered on 12 Apr 2015

4 answers

2.2K+ views

Need Help on Fiddler Host Remapping, HTTP Error 400 (Bad Request)

Hi,

I tried to emulate my site running on a domain in my local machine by using Host Remapping in Fiddler. I am using Visual Studio 2013 and hence the site runs on IIS Express (via CTRL+F5). For example, if IIS Express assigns http://localhost:2491/ to my site, I put:

localhost:2491 test.com

At the Host Remapping setting. However, browser returns: Bad Request - Invalid Hostname HTTP Error 400. The request hostname is invalid.

I can access the site normally via localhost:2491 as expected. So yeah does anyone know the workaround to this?

Thanks in advance!

Ryan.

Fiddler Classic