From dffaa0bfcea9a0aa532493b0c9eaefa5c93b8756 Mon Sep 17 00:00:00 2001
From: EdenTrainorCDL <71351828+EdenTrainorCDL@users.noreply.github.com>
Date: Sat, 15 Nov 2025 10:33:51 -0500
Subject: [PATCH] fix(oauth_proxy): :bug: add _extra_token_params as kwargs in
 refresh_token call (#2387)

custom oauth providers sometimes require extra parameters in their token calls, hence the need for the _extra_token_params in the inital token request. This PR includes those extra token params in the token refresh request too.
---
 src/fastmcp/server/auth/oauth_proxy.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/fastmcp/server/auth/oauth_proxy.py b/src/fastmcp/server/auth/oauth_proxy.py
index 8cfa46d66..516fd592e 100644
--- a/src/fastmcp/server/auth/oauth_proxy.py
+++ b/src/fastmcp/server/auth/oauth_proxy.py
@@ -1326,6 +1326,7 @@ class OAuthProxy(OAuthProvider):
                 url=self._upstream_token_endpoint,
                 refresh_token=upstream_token_set.refresh_token,
                 scope=" ".join(scopes) if scopes else None,
+                **self._extra_token_params,
             )
             logger.debug("Successfully refreshed upstream token")
         except Exception as e: