From 4f24b8bc6faaea456d92f8296fbc84a560c3c8c6 Mon Sep 17 00:00:00 2001
From: Henry Mao <1828968+calclavia@users.noreply.github.com>
Date: Tue, 24 Jun 2025 04:36:54 +0800
Subject: [PATCH] Fix `/.well-known/oauth-authorization-server` dropping path

---
 src/client/auth.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/client/auth.ts b/src/client/auth.ts
index d953e1f0..35105daa 100644
--- a/src/client/auth.ts
+++ b/src/client/auth.ts
@@ -297,7 +297,9 @@ export async function discoverOAuthMetadata(
   authorizationServerUrl: string | URL,
   opts?: { protocolVersion?: string },
 ): Promise<OAuthMetadata | undefined> {
-  const url = new URL("/.well-known/oauth-authorization-server", authorizationServerUrl);
+  const wellKnownPath = `/.well-known/oauth-authorization-server${issuer.pathname}`;
+  const url = new URL(wellKnownPath, authorizationServerUrl);
+
   let response: Response;
   try {
     response = await fetch(url, {