HTTP Request Smuggling — CL.TE, TE.CL, TE.TE, HTTP/2 Downgrade

How two HTTP parsers disagreeing about where a request ends turns into pre-auth account takeover. HTTP/1.1 keep-alive, CL vs TE delimiters, all four desync variants, HTTP/2 downgrade attacks, the detection workflow, and per-server mitigation — walked through step by step.

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