1 Answer, 1 is accepted
As far as I know, chatgpt works only with HTTP/2. Fiddler Classic does not support HTTP/2, so it is not possible to have the requests proxied through Fiddler Classic. You can try using Fiddler Everywhere, which has HTTP/2 support.
Regarding the Cloudflare question - this one is interesting. I'm not sure how Cloudflare detects it, probably they rely on some specific cipher (list of ciphers) that is being sent. Also, it could be a fingerprint of the sender, which is determined in a way that is different when using MITM proxy. Of course, these are just ideas, probably the Cloudflare team is the only one who can give a proper answer.
Regards,
Rosen Vladimirov
Progress Telerik
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Hi Rosen Vladimirov,
We tried Fiddler Everywhere too by enabling HTTP 2.0. We still get the 403 status code.
Hey Lokesh,
No issues are observed from our side, but note that the Chat-GPT servers are a bit overloaded these days and often fall during the authentication process. Apart from that ensure that the HTTP/2 support is explicitly enabled in Fiddler Everywhere
Then try to login in to ChatGPT through the Fiddler's independent browser instance.