Kyle Isom b6c96ad42f Add integration tests for multi-hop, gRPC trailers, and HTTP/1.1 ...

Multi-hop integration tests (server package):
- TestMultiHopProxyProtocol: full edge→origin deployment with two
  mc-proxy instances. Edge uses L4 passthrough with send_proxy_protocol,
  origin has proxy_protocol listener with L7 route. Verifies the real
  client IP (127.0.0.1) flows through PROXY protocol into the origin's
  X-Forwarded-For header on the h2c backend.
- TestMultiHopFirewallBlocksRealIP: origin firewall blocks an IP from
  the PROXY header while allowing the TCP peer (edge proxy). Verifies
  the backend is never reached.

L7 package integration tests:
- TestL7LargeResponse: 1 MB response through the reverse proxy.
- TestL7GRPCTrailers: HTTP/2 trailer propagation (Grpc-Status,
  Grpc-Message) through the reverse proxy, validating gRPC
  compatibility.
- TestL7HTTP11Fallback: client negotiates HTTP/1.1 only (no h2 ALPN),
  verifies the proxy falls back to HTTP/1.1 serving and still
  forwards to the h2c backend successfully.

Also updates PROGRESS.md to mark all five phases complete.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-25 14:02:45 -07:00

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