From fba86b6b545981ea76fee26f0d454ea08a02b27d Mon Sep 17 00:00:00 2001
From: fzyzcjy <5236035+fzyzcjy@users.noreply.github.com>
Date: Mon, 21 Apr 2025 07:00:15 +0800
Subject: [PATCH] Tiny improve error message (#5526)

---
 python/sglang/lang/backend/runtime_endpoint.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/python/sglang/lang/backend/runtime_endpoint.py b/python/sglang/lang/backend/runtime_endpoint.py
index 1cd3d5246..afda890a7 100644
--- a/python/sglang/lang/backend/runtime_endpoint.py
+++ b/python/sglang/lang/backend/runtime_endpoint.py
@@ -324,7 +324,11 @@ class RuntimeEndpoint(BaseBackend):
 
     def _assert_success(self, res):
         if res.status_code != 200:
-            raise RuntimeError(res.json())
+            try:
+                content = res.json()
+            except json.JSONDecodeError:
+                content = res.text
+            raise RuntimeError(content)
 
 
 def compute_normalized_prompt_logprobs(input_logprobs):