diff --git a/python/sglang/srt/entrypoints/http_server.py b/python/sglang/srt/entrypoints/http_server.py
index 76e999498..c8b5fcbeb 100644
--- a/python/sglang/srt/entrypoints/http_server.py
+++ b/python/sglang/srt/entrypoints/http_server.py
@@ -1431,8 +1431,8 @@ def launch_server(
             _global_state.tokenizer_manager.socket_mapping.clear_all_sockets()
 
 
-# Minimal 2x2 black PNG (base64, 1x1 image would cause ambiguous in image channel dimension)
-MINIMUM_PNG_PICTURE_BASE64 = "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEElEQVQImWNgYGD4z8DAAAQYAAH7u8WFAAAAAElFTkSuQmCC"
+# Minimal 32x32 black PNG (base64, GLM4v requires at least 32x32 sized image)
+MINIMUM_PNG_PICTURE_BASE64 = "iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAbUlEQVRYhe3VsQ2AMAxE0Y/lIgNQULD/OqyCMgCihCKSG4yRuKuiNH6JLsoEbMACOGBcua9HOR7Y6w6swBwMy0qLTpkeI77qdEBpBFAHBBDAGH8WrwJKI4AAegUCfAKgEgpQDvh3CR3oQCuav58qlAw73kKCSgAAAABJRU5ErkJggg=="
 
 
 def _execute_server_warmup(
@@ -1535,7 +1535,7 @@ def _execute_server_warmup(
                 headers=headers,
                 timeout=600,
             )
-            assert res.status_code == 200, f"{res}"
+            assert res.status_code == 200, f"{res.text}"
             _global_state.tokenizer_manager.server_status = ServerStatus.Up
 
         else:
diff --git a/test/srt/test_vision_openai_server_a.py b/test/srt/test_vision_openai_server_a.py
index 6c6989aa0..9642d5530 100644
--- a/test/srt/test_vision_openai_server_a.py
+++ b/test/srt/test_vision_openai_server_a.py
@@ -136,9 +136,6 @@ class TestKimiVLServer(ImageOpenAITestMixin):
         pass
 
 
-@unittest.skip(
-    "Temporarily disabling this test to fix CI. It should be re-enabled when #11800 is done."
-)
 class TestGLM41VServer(ImageOpenAITestMixin, VideoOpenAITestMixin):
     model = "zai-org/GLM-4.1V-9B-Thinking"
     extra_args = [