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Fiddler Not Capturing Some Requests

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Emre
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Emre asked on 23 Jul 2020, 10:27 PM

Hello. I have an application. But Fiddler doesn't capture all requests of my application. It doesn't capture few requests. But Fiddler works fine in browsers like Chrome and Firefox. I tried Wireshark for same application, and it captured the requests that Fiddler couldn't capture. And, these "uncaptured" requests are HTTPS. I have enabled HTTPS Decryption. I need full URL and response data of these requests. Can you help me please? I apologize for my English.

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Nick Iliev
Telerik team
answered on 24 Jul 2020, 06:33 AM

Hello Emre,

 

If possible please share a request that is not being captured by Fiddler so we could investigate further. Is the application using HTTP/HTTPS protocol to make its requests? Note that Fiddler will be able to capture only web traffic that does through HTTP, HTTPS, and FTP protocols.

 

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Nick Iliev
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Emre
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answered on 24 Jul 2020, 08:40 AM

Hello Nick,

 

Thanks for responding. I guess it uses HTTP/HTTPS protocol. Because Fiddler captures other requests of the appliction.

This the URL of that request; https://anonymouswebapi20190929061919.azurewebsites.net/api/games

I need response data, and Headers of applications request.

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Nick Iliev
Telerik team
answered on 24 Jul 2020, 09:19 AM

Hello Emre,

 

Indeed the request itself is successfully captured when executed through browser or via the Composer (it returns authentication error which is expected as I am not passing required credentials). So I guess it has something to do with the way your application is making the request. You might try to change the SSL/TLS version as discussed here. The Fiddler client provides options do that via the menu Tools > Options > HTTPS and from that point check the option to ignore certificate errors and then manually add the wanted version of the HTTPS protocols.

 

Regards,
Nick Iliev
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Emre
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answered on 24 Jul 2020, 09:54 AM
Hello Nick,

Thanks for your help, changing SSL/TLS version worked. But I guess application has  some sort of Anti-Wireshark/Fiddler. It shutdowns itself when I open Fiddler. I will try to find a way to bypass it. It is not my own application by the way.
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Nick Iliev
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Emre
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