nsqd: add opt-in --http-reject-chunked flag to reject chunked requests #1516
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Behavior : when HTTPRejectChunked is true, doPUB and doMPUB return 400 for chunked requests.
Provides operators a safe, non-breaking way to opt in to stricter HTTP handling (reject chunked requests) without changing default behavior or breaking existing clients. Helps fail early for clients that must avoid chunked bodies.
It replaces the TODO
// TODO: one day I'd really like to just error on chunked requests
// to be able to fail "too big" requests before we even read