nx_http_header_find.nx

nx_http_header_find.nx -- case-insensitive HTTP header search. Per RFC 7230 §3.2: header field names are case-insensitive. This primitive scans a raw response header block + finds a named header + returns its value start offset + length via out params. Used by: - ACME (RFC 8555) Replay-Nonce extraction - HTTP/HTTPS clients reading Location / Content-Type / etc. - Audit-log header parsing - Substrate browser cookie + content-disposition extraction Header block format (RFC 7230 §3): <status-line> CRLF <name>: <value> CRLF <name>: <value> CRLF ... CRLF (We accept LF-only too for tolerance per RFC 7230 §3.5.) Per cardinal feedback-defensive-at-boundaries-trusting-internally: search is bounded by the caller-supplied header_block_len; never walks past. nx_capability_claims: needs: [sealed_enum, byte_ops] provides: [http_header_case_insensitive_search] safety: [no_unchecked_deref, no_floating_point, no_syscall, bounded_iteration, bit_equal_reproducible] verdict: [sealed_enum_4_state] license: ORIGINAL kind: racing_crew_specialist layer: L2 (transform: bytes -> offset+length)