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HTTPd M1 — upstream HTTP keepalive pool

Summary

Completes plan todo m1-upstream-keepalive: reuse TCP connections to inference backends with stale-fd detection, response-driven pool release, explicit Connection: keep-alive on proxied requests, and one-shot reconnect on EPIPE/ECONNRESET (avoids stale-pool 502s).

Agent continuation

  1. Run ./scripts/test-upstream-keepalive.sh after ./scripts/build-li-httpd.sh.
  2. Full plan gates: ./scripts/httpd-plan-gates.sh.
  3. Example config: packages/li-net-httpd/examples/upstream_keepalive.toml.

Changed

Area Paths
Runtime runtime/li_rt_net.c — pool acquire/release, upstream keep-alive header, reconnect
Gates scripts/test-upstream-keepalive.sh, scripts/httpd-plan-gates.sh
Example packages/li-net-httpd/examples/upstream_keepalive.toml
Plan docs/superpowers/plans/2026-05-16-li-httpd-plan.md — m1-upstream-keepalive: completed

Not changed

  • Tier-5 bench matrix / live Pages (no new CSV).

Breaking

N/A.

Security

Smoke uses loopback-only listeners; same SSRF/upstream allowlist as other M1 proxy gates.