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Evan JarrettandClaude Opus 5
416ba4a2eb
The admin crew tab renders one row per crew member and gives each row its own hx-get, so opening it on a hold with 551 crew issues 551 requests. Over HTTP/1.1 a browser runs at most ~6 per origin, so they queue six at a time and every other request to the same host queues behind them — which is why loading the relay page stalls while the crew rows are still resolving, and why the rows that lose the race come back as "Server error" toasts. The 504 behind that toast is the load balancer's, not the hold's: the hold logs those requests as 200. HTTP/2 multiplexes them over one connection and the queue disappears. It does not make the slow rows fast — that is a separate fix to the per-row identity lookup — but it stops one slow surface from blocking the rest of the panel. Two halves, because neither works alone. The load balancer terminates TLS and speaks cleartext to the origin, so ALPN never runs on the backend leg and net/http can only answer HTTP/1.1 there. Both servers now wrap their handler in h2c. The wrapper is opt-in per connection: it upgrades only for a client sending the h2c preface or "Upgrade: h2c", and passes everything else through untouched, so an HTTP/1.1 WebSocket upgrade is unaffected. Verified both directions against this wiring — HTTP/1.1 for a plain client, HTTP/2.0 with --http2-prior-knowledge. The frontend's http2_enabled was never set, so it sat at the UpCloud default of off. That is the half the browser actually sees. timeout_client is now stated explicitly at its current 10s rather than left implicit: it is the boundary that produces the 504s above, so it belongs somewhere visible. It is deliberately unchanged — raising it without fixing the slow lookup would only make a stalled row stall longer. The hold's *backend* stays on HTTP/1.1. It serves subscribeRepos over WebSocket to external relays and to the scanner, and WebSocket over HTTP/2 needs the RFC 8441 Extended CONNECT that Go's http2 server does not implement for Upgrade:. Routing that backend over h2 would break the firehose. The appview accepts no inbound WebSocket and has no such constraint. Both origins carry h2c regardless, so enabling it for the hold later is a config change, not a code change. createLoadBalancer only runs when there is no LB yet, so properties set there would reach a new deployment and never an existing one. ensureLBHTTP2 reconciles them onto an LB that already exists, following ensureLBForwardedHeaders: read what is there, change only what differs, report what it did, and no-op on a second run. Backend modifies carry the existing health check back, since Properties replaces the object wholesale. Also gofmt: provision.go was not gofmt-clean at HEAD, unrelated to this change. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TA9D4DjaLZTvzQ7dJbu4eg