http.nx

http.nx -- HTTP/1.1 request parser (RFC 7230/9112 subset). Parses an HTTP request from a byte buffer (typically accumulated from socket reads). Reader-only subset: - Request line: METHOD SP path SP HTTP/1.1 CRLF - Headers: Name ": " Value CRLF (until empty line) - Body: remaining bytes per Content-Length Response generation is the caller's job; we provide a typed view of the request + a Content-Length header lookup helper. Real-world HTTP servers add: chunked transfer, keep-alive, HTTP/2 framing, pipelining. Those are future work. Invariants: H1 All reads bounds-check against caller-supplied buffer end. H2 Header parsing stops at CRLF CRLF (empty line) per RFC 7230 §3. H3 Returns offsets into the caller's buffer; nothing copied. Parser struct owns only position metadata. H4 Malformed input returns negative HTTP_ERR_*; no silent acceptance of weird forms (e.g. bare LF line ends).