From 54689d523c56944e46306fb89d5ba7c7d4519346 Mon Sep 17 00:00:00 2001
From: root <root@island37.com>
Date: Sat, 25 Apr 2026 23:37:52 -0500
Subject: [PATCH] =?UTF-8?q?observer:=20fix=20gateway=20health=20probe=20?=
 =?UTF-8?q?=E2=80=94=20text/plain=20not=20JSON?=
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Same bug as matrix-agent-validated 5db0c58. observer.ts:645 did
fetch().then(r => r.json()) against /health which returns text/plain
"lakehouse ok". r.json() throws on non-JSON, .catch swallows to null,
observer exits assuming gateway down. With systemd Restart=on-failure
this crash-loops every 5s — confirmed live on matrix-test box today.

Fix: r.ok ? r.text() : null. Same shape, accepts the actual content
type. Sealed in pathway_memory as TypeConfusion:fetch-health-json.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 mcp-server/observer.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mcp-server/observer.ts b/mcp-server/observer.ts
index 1150af1..9984fb5 100644
--- a/mcp-server/observer.ts
+++ b/mcp-server/observer.ts
@@ -642,7 +642,7 @@ async function main() {
   console.error(`[observer] started — cycle=${CYCLE_SECS}s, gateway=${GATEWAY}, port=${OBSERVER_PORT}`);
 
   // 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) {
     console.error("[observer] gateway unreachable — exiting");
     process.exit(1);