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I'm getting below error while opening fiddler classic 

---------------------------

Loading custom MIME mappings 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.

The cloud file provider is not running.



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

   at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)

   at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)

   at System.Xml.XmlTextReaderImpl.InitStreamInput(Uri baseUri, String baseUriStr, Stream stream, Byte[] bytes, Int32 byteCount, Encoding encoding)

   at System.Xml.XmlTextReaderImpl..ctor(String url, Stream input, XmlNameTable nt)

   at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)

   at Fiddler.XmlFileMimeMappings..ctor(String filePath) in C:\Jenkins\Fiddler_Windows\workspace\FiddlerCore\FiddlerCore.Shared\Common\Core\MimeMapping\XmlFileMimeMappings.cs:line 40

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Fiddler.Shared\Viewer.cs:line 9957


Fiddler v5.0.20211.51073 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.22000.0] 
---------------------------
OK   
---------------------------
Velkumar
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Rank 1
 asked on 01 Jun 2022
0 answers
231 views

Hi,

I'm trying to find the way to read the next string after finding given text in response html.

It will contain fe. "someNum is: 1234" but the number will be different in every response.

My question is, how to grab the number, which sits in the string, when finding begginnig of the string which is "someNum is:"

 

if (oSession.oResponse.headers.ExistsAndContains("Content-Type", "html") {

    oSession.utilDecodeResponse();

oSession.utilFindInResponse("someNum is:");

var = <here I want to put the value, whatever it is>;

oSession.Log.LogString(var);

}

Thanks.

Ararad
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Rank 1
 updated question on 01 Jun 2022
1 answer
226 views

Hello all,

 

I have a request parameter (guiStatusGZ) which is compressed and I want to uncompress it to edit the data before displaying in the UI via response.

 

Kind regards,

Sasikumar

Nick Iliev
Telerik team
 answered on 31 May 2022
1 answer
1.8K+ views

Hi,

I have run a Nodejs application on localhost, which receives requests from an external DNS and do some actions as a result. In order to be able to capture the incoming traffic from the Internet to my localhost server, I have set a reverse proxy using Fiddler classic docs, which works fine and I can see any request that is going to my server. However, inside my application, there are some API calls, which are not local and they are accessible through the Internet. The problem is that Fiddler doesn't capture any outgoing traffic from my app to the Internet. All of those API calls work fine and are successful. I have checked whole the Internet and unfortunately couldn't find any useful solution. I have also added some screenshots from important configs of Fiddler. I also run my server on 127.0.0.1:3000. I hope you can address my problem. Thanks!

 

Ehsan
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Iron
 answered on 30 May 2022
0 answers
479 views

Currently Fiddler Classic supports WebView using old IE control that makes low compatibility for modern web. and I need to see some request using WebView, but it doesn't show me the 'correct' view, for modern HTML. I think using WebView2 for it is good idea for modern web.

(sorry for bad english)

some
Top achievements
Rank 1
 asked on 22 May 2022
1 answer
115 views

Why would a https page work successfully when running a fiddler capture but then when i close fiddler, the page no longer works?
I have the decrypt https traffic options selected 

How would i get that to stop so i can capture why page does not work under normal circumstances? 

Nick Iliev
Telerik team
 answered on 20 May 2022
1 answer
6.8K+ views

Hello all,

I have seen various threads about this topic but although I followed all the recommendations, nothing had a successful result. I have installed fiddler on my new Win10 laptop. Hotspot is created through NoWifi windows app since the driver does not directly support hotspot. Mobile is connecting normally to the hotspot and has access to internet without a problem (sharing my ethernet with the mobile hotspot). When I modify the wifi connection on the mobile to give the ip and port for the fiddler proxy, the mobile has no access to the internet any more.

Fiddler has:

  • Enabled Capture HTTPS CONNECTs
  • Enabled Decrypt HTTPs traffic
  • Enabled Allow remote computers to connect

And has been restarted after the settings have configured.

When I connect to the wifi with the mobile, I try to reach the ipv4.fiddler:8888/ page but I get Site can't be reached...

I have also tried to change the certificate generator to BouncyCastle but this did not work either.

Any ideas would be greatly appreciated.

Thank you very much,

Haris

Haris
Top achievements
Rank 1
Iron
 answered on 17 May 2022
2 answers
3.3K+ views

Hello,

 

Does Fiddler Everywhere support websockets?

If it does how can I enable it?

Thank you in advance.

Nick Iliev
Telerik team
 answered on 13 May 2022
1 answer
173 views

Dear(s),

I wanna know whether Progress Telerik Fiddler Web Debugger and fiddler classic actually is a same software, only with different name or different version?

 

Regards

 

Nick Iliev
Telerik team
 answered on 12 May 2022
1 answer
1.7K+ views

Hi everyone,

After hours of using the Progress Telerik Fiddler Classic, i'm blocked. I'm trying to intercept a web socket secure (WSS) over TLS, that's why I'm using the HTTPS MITM Proxy.

I have registred all the SSL Root certificates and everything is working. But when I show the Web socket inspector, I couldn't translate the binary to human readable text. After some researchs, it seems that I need to decode the payload ?

Does FiddlerClassic permit to translate the binary of a web socket frame to the text human readable ?

Here a screenshot:

 

Big thanks in advance for all your help. Have a nice end of day,

Respectfully

Nick Iliev
Telerik team
 answered on 10 May 2022
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