fix(proxy_server.py): support langfuse logging for rejected requests on /v1/chat/completions

litellm/proxy/utils.py

@@ -31,6 +31,7 @@ from litellm.caching import DualCache, RedisCache
 from litellm.exceptions import RejectedRequestError
 from litellm.integrations.custom_logger import CustomLogger
 from litellm.integrations.slack_alerting import SlackAlerting
+from litellm.litellm_core_utils.litellm_logging import Logging
 from litellm.llms.custom_httpx.httpx_handler import HTTPHandler
 from litellm.proxy._types import (
     AlertType,
@@ -595,6 +596,23 @@ class ProxyLogging:
                 )
             )
 
+        ### LOGGING ###
+        litellm_logging_obj: Optional[Logging] = request_data.get(
+            "litellm_logging_obj", None
+        )
+
+        if (
+            isinstance(original_exception, HTTPException)
+            and litellm_logging_obj is not None
+        ):
+            # log the custom exception
+            await litellm_logging_obj.async_failure_handler(
+                exception=original_exception,
+                traceback_exception=traceback.format_exc(),
+                start_time=time.time(),
+                end_time=time.time(),
+            )
+
         for callback in litellm.callbacks:
             try:
                 _callback: Optional[CustomLogger] = None
@@ -611,6 +629,7 @@ class ProxyLogging:
                     )
             except Exception as e:
                 raise e
+
         return
 
     async def post_call_success_hook(