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1 answer
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Hi Team

I would like to know how I can add comment to captured calls via command line using ExecAction. This is for identification like start of login , start of some other transaction etc..

Tried to find references in CustomRules.js , no luck there.

Regards

Sujeet V

Nick Iliev
Telerik team
 answered on 21 Jun 2021
1 answer
529 views

Hello. I installed Fiddler 4 and now whenever I use NuGet, in Visual Studio 2019 or in other applications that use NuGet, no feeds work unless I open Fiddler 4. I thought that removing Fiddler 4 and the HTTPS certificate would fix the problem, but it didn't, so I reinstalled Fiddler 4 to be able to use NuGet.

I also had Fiddler Everywhere installed, but having it open or closed doesn't make NuGet work, only Fiddler 4 does.

Things I tried:

  • remove the HTTP certificate, ensure no proxy settings are set, also checked HTTP_PROXY env variable is not set, rebooting
  • when I open Fiddler 4 I can see the proxy settings, removing them while Fiddler 4 is still running does NOT break NuGet (I expected the proxy settings to be the problem, but they are not?)
  • uninstall Fiddler 4 (and Fiddler Everywhere) and reboot
  • followed multiple instructions from here https://www.telerik.com/forums/fiddler-proxy-settings-have-corrupted-visual-studio-networking

I'm at a loss here, I just want NuGet to work without having to open Fiddler. How can it still be broken even after removing Fiddler?

What else should I try?

Nick Iliev
Telerik team
 answered on 16 Jun 2021
0 answers
532 views

Installing fiddler and and first start receive the error unable to create following file :

the file never gets created

I've check one drive permissions and I have full permissions. Any  yes using OD4B

Is there a setting to change the location of the CustomMimeMappings.xml', I presume its one drive causing the problem

 

Thanks

M

 

---------------------------
Generating default MIME mappings file failed
---------------------------
Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

Could not find file 'C:\Users\username\OneDrive\Documents\Fiddler2\CustomMimeMappings.xml'.

Type: System.IO.FileNotFoundException
Source: mscorlib
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)

   at System.IO.FileStream..ctor(String path, FileMode mode)

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Fiddler.Shared\Viewer.cs:line 9948


Fiddler v5.0.20204.45441 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.18363.0] 
---------------------------
OK   
---------------------------
Martyn
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 asked on 16 Jun 2021
1 answer
717 views


I need to explore the traffic from one program.

The program makes something like a connection through the WebSockets.

Fiddler displays this:

Request Headers: `CONNECT 144.***:443 HTTP/1.0`

Response: `HTTP/1.0 200 Connection Established`

End empty body.

But httpanalyzer displays full information after that response, and that information continues flowing. Very likely like WebSockets (one connection and receive more answers).


And fiddler display zero traffic.

How can I explore such traffic through the fiddler?

Updade1: No websockets icon and websockets tab

Serhio
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 updated question on 15 Jun 2021
1 answer
154 views

Hi,

I need to detect row change so i tried your sample

https://www.telerik.com/kendo-angular-ui/components/grid/editing/editing-row-click/

 

But i have following error message

Error: src/app/app.component.ts:25:31 - error TS2554: Expected 0 arguments, but got 1.

25             (add)="addHandler($event)"

 

Regards                                 ~~~~~~

Dimiter Topalov
Telerik team
 answered on 15 Jun 2021
0 answers
151 views

My project: https://www.telerik.com/forums/attachments/1024176

On this project, for example, when I enter the yahoo.com site, I can change the response result of this site. However, when I want to change this page yahoo.com/fiddler_love and enter this page, I get 404 error result. 404 Error Response I cannot change the response value of the pages I receive. How can I change the response value of the pages that I get a 404 error, that is, nonexistent? For example, in the application I gave in the link above, I can change the response value of the yahoo.com page. Because such a page exists, but yahoo.com/fiddler_love this page's response does not change.

Because there is no such page. In summary, how can I change the response value of this page? 404 How does the response value change regardless? Thanks <3

Dream
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 asked on 11 Jun 2021
0 answers
382 views

I am writing a dll file and need to extract json from the response information. When I use c# to write the following code, I run an error in fiddler, please help me. Thank you very much.

dynamic  data = JObject.Parse(source);
 string re = data.result;

 

 

runing  result :

Fiddler has encountered an unexpected problem with an extension. Could not load the file or assembly "Newtonsoft.Json,Version=13.0.0.0, Culture=neutral,PublickeyToken=30ad4fe6b2a6aeed" or one of its dependencies. The system can not find the file specified.
Type:System.IO.FileNotFoundException
Source:sms
walker
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Iron
 asked on 09 Jun 2021
1 answer
284 views

var ip = System.Net.Dns.GetHostAddresses("google.com")[0].ToString();

When the program is run through Fiddler. The above code returns the localhost IP.
I try setting breakpoints at BeforeRequest and BeforeResponse and AfterSessionComplete but no event is recorded?
May I ask is there a way to make it return the correct google.com IP?
Administrator
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Iron
 answered on 08 Jun 2021
3 answers
5.5K+ views
Hi,

Fiddler runs on PC whits Windows 7x64:

Fiddler Web Debugger (v4.4.9.0)
Built: 8 июля 2014 г.
 
64-bit AMD64, VM: 43,00mb, WS: 72,00mb
.NET 4.0.30319.17929 WinNT 6.1.7601 SP1

I'm trying to capture HTTS traffic from Android. Trusted certificate was installed, and I can see traffic from some sites, such as Google.

But on few site, such as Twitter, I get error:

CONNECT twitter.com:443 HTTP/1.1
Host: twitter.com
Connection: keep-alive
User-Agent: Mozilla/5.0 (Linux; Android 4.4.4; Nexus 5 Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.99 Mobile Safari/537.36

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.3 (TLS/1.2)
Random: 54 D3 2B C1 BC 2C 00 09 2A 61 34 84 2A CD 1C CB 14 33 DD 7D 30 44 16 80 E4 94 FA AA CC 76 24 B6
SessionID: 79 46 00 00 36 D9 BA 70 AA 0E 97 A6 10 8B BA 99 95 BD E7 D2 08 4B 5D 93 80 09 14 55 F2 C2 4A 9F
Extensions:
    server_name    twitter.com
    ec_point_formats    uncompressed [0x0]
    elliptic_curves    secp521r1 [0x19], secp384r1 [0x18], secp256r1 [0x17]
    SessionTicket    empty
    signature_algorithms    00 20 06 01 06 02 06 03 05 01 05 02 05 03 04 01 04 02 04 03 03 01 03 02 03 03 02 01 02 02 02 03 01 01
    NextProtocolNegotiation    empty
    channel_id(GoogleDraft)    empty
Ciphers:
    [C014]    TLS1_CK_ECDHE_RSA_WITH_AES_256_CBC_SHA
    [C00A]    TLS1_CK_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
    [0039]    TLS_DHE_RSA_WITH_AES_256_SHA
    [0038]    TLS_DHE_DSS_WITH_AES_256_SHA
    [0035]    TLS_RSA_AES_256_SHA
    [C012]    TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
    [C008]    TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
    [0016]    SSL_DHE_RSA_WITH_3DES_EDE_SHA
    [0013]    SSL_DHE_DSS_WITH_3DES_EDE_SHA
    [000A]    SSL_RSA_WITH_3DES_EDE_SHA
    [C02F]    TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
    [C02B]    TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
    [C013]    TLS1_CK_ECDHE_RSA_WITH_AES_128_CBC_SHA
    [C009]    TLS1_CK_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
    [00A2]    Unrecognized cipher - See http://www.iana.org/assignments/tls-parameters/
    [009E]    TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
    [0033]    TLS_DHE_RSA_WITH_AES_128_SHA
    [0032]    TLS_DHE_DSS_WITH_AES_128_SHA
    [009C]    TLS_RSA_WITH_AES_128_GCM_SHA256
    [002F]    TLS_RSA_AES_128_SHA
    [C011]    TLS_ECDHE_RSA_WITH_RC4_128_SHA
    [C007]    TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
    [0005]    SSL_RSA_WITH_RC4_128_SHA
    [0004]    SSL_RSA_WITH_RC4_128_MD5
    [00FF]    TLS_EMPTY_RENEGOTIATION_INFO_SCSV

Compression:
    [00]    NO_COMPRESSION

HTTP/1.1 200 Connection Established
FiddlerGateway: Direct
StartTime: 11:37:22.290
Connection: close
 
fiddler.network.https> HTTPS handshake to twitter.com failed. System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted

On another PC it's OK on the same device. Thanks for any ideas.
yo
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Iron
 answered on 03 Jun 2021
1 answer
2.4K+ views

Hi,

I've installed Fiddler Everywhere(1.6.0) about 2 weeks ago on my Windows 10 machine and it worked fine. Since about a week, I can't start it, if I open the exe file, nothing happens.

I tried reinstalling it, I've installed even 1.6.1, but I experience the same symptom.  Please find the latest entries from AppData\Roaming\Fiddler Everywhere\Logs\electron.log file:

[2021-06-01 15:10:07:470] [info] [Product information] Fiddler Everywhere 1.6.1
[2021-06-01 15:10:07:473] [info] [System information] win32 (Windows_NT/x64) - version 10.0.18363
[2021-06-01 15:10:07:514] [info] Initializing splash screen.
[2021-06-01 15:10:07:518] [info] Attempting to run server - 5 attempts left.
[2021-06-01 15:10:07:519] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:519] [info] Generating random port.
[2021-06-01 15:10:07:520] [info] Trying to start server at port [37538].
[2021-06-01 15:10:07:521] [info] Attempting to run server - 4 attempts left.
[2021-06-01 15:10:07:522] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:522] [info] Generating random port.
[2021-06-01 15:10:07:522] [info] Trying to start server at port [10761].
[2021-06-01 15:10:07:523] [info] Attempting to run server - 3 attempts left.
[2021-06-01 15:10:07:524] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:524] [info] Generating random port.
[2021-06-01 15:10:07:524] [info] Trying to start server at port [61944].
[2021-06-01 15:10:07:525] [info] Attempting to run server - 2 attempts left.
[2021-06-01 15:10:07:526] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:526] [info] Generating random port.
[2021-06-01 15:10:07:526] [info] Trying to start server at port [21829].
[2021-06-01 15:10:07:527] [info] Attempting to run server - 1 attempts left.
[2021-06-01 15:10:07:528] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:528] [info] Generating random port.
[2021-06-01 15:10:07:528] [info] Trying to start server at port [50452].
[2021-06-01 15:10:07:529] [error] Maximum number of attempts reached - quitting application.
[2021-06-01 15:10:07:530] [error] Unable to start the server, error is Maximum number of attempts reached - quitting application.
Could you please assist what might the issue? Fiddler Classic works fine without any issue.

Thank you.
Nick Iliev
Telerik team
 answered on 02 Jun 2021
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