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fix: treat MCP HTTP 406 probes as reachable

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Affaan Mustafa
2026-05-18 12:48:52 -04:00
parent b41e6fb3d0
commit 386326df8e
2 changed files with 73 additions and 2 deletions
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6
scripts/hooks/mcp-health-check.js
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@@ -26,8 +26,10 @@ const DEFAULT_BACKOFF_MS = 30 * 1000;
const MAX_BACKOFF_MS = 10 * 60 * 1000;
// The preflight HTTP probe only checks reachability; it does not have access to
// Claude Code's stored OAuth bearer token. Treat auth-gated responses as
// reachable so the real MCP client can attempt the authenticated call.
const HEALTHY_HTTP_CODES = new Set([200, 201, 202, 204, 301, 302, 303, 304, 307, 308, 400, 401, 403, 405]);
// reachable so the real MCP client can attempt the authenticated call. A
// Streamable HTTP MCP server can also return 406 to a bare GET that omits
// Accept: text/event-stream; that still proves the endpoint is alive.
const HEALTHY_HTTP_CODES = new Set([200, 201, 202, 204, 301, 302, 303, 304, 307, 308, 400, 401, 403, 405, 406]);
const RECONNECT_STATUS_CODES = new Set([401, 403, 429, 503]);
const FAILURE_PATTERNS = [
{ code: 401, pattern: /\b401\b|unauthori[sz]ed|auth(?:entication)?\s+(?:failed|expired|invalid)/i },