From c634d488b698f5343a0d81370080c971f25c9c0e Mon Sep 17 00:00:00 2001
From: Chris Wanstrath <chris@ozmm.org>
Date: Mon, 11 May 2026 16:15:49 -0700
Subject: [PATCH] Set Host header for static app tunnel routing

---
 src/server/tunnels.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/server/tunnels.ts b/src/server/tunnels.ts
index 942a1dd..d88ebdc 100644
--- a/src/server/tunnels.ts
+++ b/src/server/tunnels.ts
@@ -180,6 +180,9 @@ function openTunnel(appName: string, port: number, subdomain?: string, isReconne
     onRequest(req) {
       const app = getApp(appName)
       if (app?.tunnelUrl) req.headers['x-app-url'] = app.tunnelUrl
+      // Static apps are served by the main server via subdomain routing,
+      // so set the Host header so extractSubdomain() can identify the app
+      if (app?.static) req.headers['host'] = `${appName}.localhost`
     },
 
     onOpen(assignedSubdomain) {