some video fiddler can't capture

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Fiddler Classic
ling
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ling asked on 12 Jan 2023, 09:21 AM | edited on 12 Jan 2023, 09:30 AM

I use fiddler can capture most of the traffic , such as:

https://freetestdata.com/wp-content/uploads/2022/02/Free_Test_Data_7MB_MP4.mp4

in the console of the chrome, I can see the media size , and can capture it in fiddler;

but I can't capture the video in web.telegram.org/z/ or  web.telegram.org/k/ , in the console of chrome it shows serviceworker and I can't see the size of the media; The video can play , why can't capture it? How does the video stream send request and come back from the site?

Can I capture the video in telegram ? or save the video stream?

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Nick Iliev
Telerik team
answered on 16 Jan 2023, 08:17 AM

Hi Ling Ling,

 

Fiddler Everywhere captures traffic over HTTPS traffic and uses its CA to decrypt the TLS encryption, whereas Telegram uses MTProto, which is something like their own version of TLS. That said, anything encrypted with MTProto is, by design, protected from MITM proxies and any man-in-the-middle attack through the custom TLS implementation.

 

Regards,
Nick Iliev
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Nick Iliev
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