From 213df781ea8093c31dc26650b2e419604d49fab8 Mon Sep 17 00:00:00 2001
From: Matthew Robertson <mattrobertson@google.com>
Date: Thu, 27 Mar 2025 21:17:17 +0000
Subject: [PATCH] fix: correct handling of IGNORED_ROUTES set to empty

---
 src/server.ts | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/server.ts b/src/server.ts
index fbf565c6c..9a9b3acc3 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -136,10 +136,13 @@ export function getServer(
   }
   if (options.ignoredRoutes !== null) {
     // Ignored routes is a configuration option that allows requests to specific paths to be prevented
-    // from invoking the user's function.
-    app.use(options.ignoredRoutes, (req, res) => {
-      res.status(404).send(null);
-    });
+    // from invoking the user's function. An empty string indicates that no routes should be filtered.
+    if (options.ignoredRoutes.trim() !== '') {
+      // Any non-empty string is the used a route expression to return 404 for.
+      app.use(options.ignoredRoutes, (req, res) => {
+        res.status(404).send(null);
+      });
+    }
   } else if (options.signatureType === 'http') {
     // We configure some default ignored routes, only for HTTP functions.
     app.use('/favicon.ico|/robots.txt', (req, res) => {