curl: Duplicate chunked Transfer-Encoding lets a malicious origin smuggle a response across reused HTTP proxy connections

TL;DR A malicious HTTP origin can send Transfer-Encoding: chunked, chunked, gzip through a reusable HTTP proxy connection to bypass curl's "chunked must be last" guard, queue a forged HTTP response after its own response, and make curl parse that queued data as the response for a later request to...