From 9a7702b85be2636d4a0810ea70a3dd08e6fcec06 Mon Sep 17 00:00:00 2001
From: Jerry Lin <jerrysf@google.com>
Date: Sun, 21 Jun 2026 00:56:05 +0000
Subject: [PATCH] fix: strip trailing slashes from automatic GDCH audience

---
 .../google-auth-library-nodejs/src/auth/googleauth.ts       | 2 +-
 .../google-auth-library-nodejs/test/test.googleauth.ts      | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/core/packages/google-auth-library-nodejs/src/auth/googleauth.ts b/core/packages/google-auth-library-nodejs/src/auth/googleauth.ts
index 86e4cb4dd358..b032b4efb37c 100644
--- a/core/packages/google-auth-library-nodejs/src/auth/googleauth.ts
+++ b/core/packages/google-auth-library-nodejs/src/auth/googleauth.ts
@@ -1155,7 +1155,7 @@ export class GoogleAuth<T extends AuthClient = AuthClient> {
         const endpoint = opts.apiEndpoint || opts.servicePath;
         if (endpoint) {
           const scheme = endpoint.startsWith('http') ? '' : 'https://';
-          const formattedAudience = `${scheme}${endpoint}/`.replace(/\/+$/, '/');
+          const formattedAudience = `${scheme}${endpoint}`.replace(/\/+$/, '');
           const newClient = client.createWithGdchAudience(formattedAudience);
           this.cachedCredential = newClient;
           return newClient;
diff --git a/core/packages/google-auth-library-nodejs/test/test.googleauth.ts b/core/packages/google-auth-library-nodejs/test/test.googleauth.ts
index 350b326be6e4..4b2e44b97e16 100644
--- a/core/packages/google-auth-library-nodejs/test/test.googleauth.ts
+++ b/core/packages/google-auth-library-nodejs/test/test.googleauth.ts
@@ -3032,7 +3032,7 @@ describe('googleauth', () => {
       assert.ok(client instanceof GdchClient);
       assert.strictEqual(
         (client as GdchClient).apiAudience,
-        'https://hardwaremanagement.us-west1.gdch.google.com/'
+        'https://hardwaremanagement.us-west1.gdch.google.com'
       );
     });
 
@@ -3048,7 +3048,7 @@ describe('googleauth', () => {
       assert.ok(client instanceof GdchClient);
       assert.strictEqual(
         (client as GdchClient).apiAudience,
-        'https://hardwaremanagement.us-west1.gdch.google.com/'
+        'https://hardwaremanagement.us-west1.gdch.google.com'
       );
     });
 
@@ -3064,7 +3064,7 @@ describe('googleauth', () => {
       assert.ok(client instanceof GdchClient);
       assert.strictEqual(
         (client as GdchClient).apiAudience,
-        'http://hardwaremanagement.us-west1.gdch.google.com/'
+        'http://hardwaremanagement.us-west1.gdch.google.com'
       );
     });