fix(proxy): use get_async_httpx_client for logo download (#20155)

Replace direct AsyncHTTPHandler instantiation with get_async_httpx_client
to avoid +500ms latency per request from creating new async clients.

Added httpxSpecialProvider.UI for UI-related HTTP requests like logo downloads.

litellm/proxy/proxy_server.py

@@ -10164,9 +10164,13 @@ async def get_image():
     if logo_path.startswith(("http://", "https://")):
         try:
             # Download the image and cache it
-            from litellm.llms.custom_httpx.http_handler import AsyncHTTPHandler
+            from litellm.llms.custom_httpx.http_handler import get_async_httpx_client
+            from litellm.types.llms.custom_http import httpxSpecialProvider
 
-            async_client = AsyncHTTPHandler(timeout=5.0)
+            async_client = get_async_httpx_client(
+                llm_provider=httpxSpecialProvider.UI,
+                params={"timeout": 5.0},
+            )
             response = await async_client.get(logo_path)
             if response.status_code == 200:
                 # Save the image to a local file

litellm/types/llms/custom_http.py

@@ -26,6 +26,7 @@ class httpxSpecialProvider(str, Enum):
     RAG = "rag"
     A2A = "a2a"
     PromptManagement = "prompt_management"
+    UI = "ui"
 
 
 VerifyTypes = Union[str, bool, ssl.SSLContext]