From 22dc596cb694899334cdec3ef3d6ebcde20eabb6 Mon Sep 17 00:00:00 2001
From: wangbing35 <843345667@qq.com>
Date: Fri, 13 Feb 2026 15:15:27 +0800
Subject: [PATCH] Ensure header values are strings in returned headers

Convert header values to strings before returning.
---
 litellm/proxy/litellm_pre_call_utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litellm/proxy/litellm_pre_call_utils.py b/litellm/proxy/litellm_pre_call_utils.py
index 49d31c1efec..d48fe846a59 100644
--- a/litellm/proxy/litellm_pre_call_utils.py
+++ b/litellm/proxy/litellm_pre_call_utils.py
@@ -432,7 +432,7 @@ class LiteLLMProxyRequestSetup:
             )
             for k, v in litellm_logging_metadata_headers.items():
                 if v is not None:
-                    returned_headers["x-litellm-{}".format(k)] = v
+                    returned_headers["x-litellm-{}".format(k)] = str(v)
 
         return returned_headers