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observer: fix gateway health probe — text/plain not JSON

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The startup health check in observer.ts:645 did fetch().then(r => r.json())
against the gateway /health endpoint, which returns text/plain "lakehouse ok"
not JSON. r.json() throws, .catch swallows to null, observer concludes
"gateway unreachable" and exits. Combined with systemd Restart=on-failure
this produced a 5-second crash loop on every boot of matrix-test.

Fix: r.ok ? r.text() : null — keeps the same null-on-failure contract for
the existing if (!health) guard while accepting the actual content type.

Sealed in pathway_memory as TypeConfusion:fetch-health-json (trace at
matrix_handover_validate|mcp-server/observer.ts|service_crash_loop) so
the matrix index preempts this on any future deploy probe.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude (matrix-test) 2026-04-26 04:37:20 +00:00
parent 42448c7db5
commit 5db0c581d9
1 changed files with 1 additions and 1 deletions
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mcp-server/observer.ts
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@ -642,7 +642,7 @@ async function main() {
console.error(`[observer] started — cycle=${CYCLE_SECS}s, gateway=${GATEWAY}, port=${OBSERVER_PORT}`); console.error(`[observer] started — cycle=${CYCLE_SECS}s, gateway=${GATEWAY}, port=${OBSERVER_PORT}`);
// Run a health check first // Run a health check first
const health = await fetch(`${GATEWAY}/health`).then(r => r.json()).catch(() => null); const health = await fetch(`${GATEWAY}/health`).then(r => r.ok ? r.text() : null).catch(() => null);
if (!health) { if (!health) {
console.error("[observer] gateway unreachable — exiting"); console.error("[observer] gateway unreachable — exiting");
process.exit(1); process.exit(1);