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ginuerzh
2299c43bb7
Implement the header counterpart of the existing body rewrite:
- rewriteHeaderBlock applies rewrite rules to an http.Header in place.
Regex mode matches header names case-insensitively (per HTTP spec) and
rewrites each value independently; an empty replacement drops the value,
and a fully-empty header is deleted. Plugin mode serializes the header
block (http.Header.Write + trailing CRLF, since ReadMIMEHeader needs the
blank line), sends it to a core/rewriter.Rewriter plugin, and parses the
result back with clear+copy (h is a map; reassignment would not escape).
- rewrite_metadata.go consolidates the hand-rolled plugin metadata maps
(baseMetadata + three SSE inline maps) into rewriteMeta() with common
sid/direction/uri fields and a new kind (body|header), additive for
existing plugins.
- sniffer_http.go wires rewriteReqHeader before the request is written
upstream (and refreshes the recorder header clone) and rewriteRespHeader
after static response-header overrides, before the recorder clone.
- hostPattern: derive req.Host from the request path via regex submatch
expansion (Host = $1-style template), for Host-routed mirror origins.
- parse: parseHeaderRewrites gates on the config string (regexp.Compile("")
yields a non-nil match-all, so gating on the compiled regexp would turn
an empty name into a silent no-op rule).
Fixes found by e2e: reqHeaderRewrites was assigned after its guard, so the
request header rewrite never ran; tests cover the header round-trip,
plugin gating, metadata kind, and hostPattern expansion.