1b07475bf3
Each rewriteBody/rewriteResponseBody/rewriteRequestBody rule can now optionally reference a named rewriter plugin (HTTP/gRPC backend) via the rewriter field. When set, body rewriting delegates to the plugin rather than applying pattern/replacement, while content-type filtering still applies. Coincident fixes: - rewriter/plugin/grpc: return nil when conn is nil (avoid nil-ptr panic) - rewriter/plugin/http: drain response body in defer to prevent leaks - config/parsing/rewriter: pass TimeoutOption to gRPC plugin - config/parsing/service: warn when referenced rewriter is not registered