refactor(http_parsing_utils.py): streamline request body handling and memory management

- Removed the weak reference cache for request bodies and replaced it with direct storage on the request object to prevent memory leaks.
- Implemented immediate garbage collection every 100 requests to manage memory usage effectively.
- Added a cleanup function to explicitly free memory associated with request processing.
- Updated the logic for retrieving and storing parsed request bodies to enhance performance and reliability.

litellm/proxy/common_utils/http_parsing_utils.py

@@ -1,5 +1,4 @@
 import json
-import weakref
 from typing import Any, Dict, List, Optional
 
 import orjson
@@ -9,10 +8,6 @@ from litellm._logging import verbose_proxy_logger
 from litellm.proxy._types import ProxyException
 from litellm.types.router import Deployment
 
-# Use a regular dictionary with manual cleanup
-# WeakValueDictionary doesn't work well with our setup since request objects may be kept alive
-_request_body_cache: Dict[int, Dict] = {}
-
 
 async def _read_request_body(request: Optional[Request]) -> Dict:
     """
@@ -49,7 +44,19 @@ async def _read_request_body(request: Optional[Request]) -> Dict:
                 parsed_body = {}
             else:
                 try:
+                    # Parse and immediately clear body reference to prevent memory accumulation
                     parsed_body = orjson.loads(body)
+                    del body  # Clear body reference immediately
+                    
+                    # Force garbage collection every 100 requests to prevent accumulation
+                    import gc
+                    if hasattr(_read_request_body, '_gc_counter'):
+                        _read_request_body._gc_counter += 1
+                    else:
+                        _read_request_body._gc_counter = 1
+                    
+                    if _read_request_body._gc_counter % 100 == 0:
+                        gc.collect()
                 except orjson.JSONDecodeError as e:
                     # First try the standard json module which is more forgiving
                     # First decode bytes to string if needed
@@ -95,36 +102,15 @@ async def _read_request_body(request: Optional[Request]) -> Dict:
         return {}
 
 
-def clear_request_cache(request: Optional[Request] = None) -> None:
-    """
-    Clear cached request bodies to free memory.
-    
-    Parameters:
-    - request: If provided, only clear cache for this specific request.
-               If None, clear entire cache.
-    """
-    global _request_body_cache
-    
-    if request is not None:
-        request_id = id(request)
-        if request_id in _request_body_cache:
-            try:
-                del _request_body_cache[request_id]
-            except KeyError:
-                pass
-    else:
-        # Clear entire cache
-        _request_body_cache.clear()
 
 
 def _safe_get_request_parsed_body(request: Optional[Request]) -> Optional[dict]:
     if request is None:
         return None
     
-    # Try to get from cache first
-    request_id = id(request)
-    if request_id in _request_body_cache:
-        return _request_body_cache[request_id]
+    # Check if we already have a parsed body stored directly on the request object
+    if hasattr(request, "_litellm_parsed_body"):
+        return getattr(request, "_litellm_parsed_body")
     
     # Fallback to checking request.scope for backward compatibility
     if (
@@ -134,13 +120,34 @@ def _safe_get_request_parsed_body(request: Optional[Request]) -> Optional[dict]:
     ):
         accepted_keys, parsed_body = request.scope["parsed_body"]
         result = {key: parsed_body[key] for key in accepted_keys}
-        # Clean up the scope to free memory
+        # Clean up the scope to free memory and store on request object
         del request.scope["parsed_body"]
-        # Store in our cache for consistency
-        _request_body_cache[request_id] = result
+        setattr(request, "_litellm_parsed_body", result)
         return result
     return None
 
+
+def cleanup_request_memory(request: Optional[Request]) -> None:
+    """
+    Explicitly cleanup request memory to prevent leaks.
+    Call this after request processing is complete.
+    """
+    if request is None:
+        return
+    
+    try:
+        # Remove parsed body from request object
+        if hasattr(request, "_litellm_parsed_body"):
+            delattr(request, "_litellm_parsed_body")
+        
+        # Clean up any remaining scope data
+        if hasattr(request, "scope") and "parsed_body" in request.scope:
+            del request.scope["parsed_body"]
+            
+    except Exception:
+        pass  # Silent cleanup - don't break request processing
+
+
 def _safe_get_request_query_params(request: Optional[Request]) -> Dict:
     if request is None:
         return {}
@@ -162,16 +169,10 @@ def _safe_set_request_parsed_body(
         if request is None:
             return
         
-        # Store in cache with size limit to prevent unbounded growth
-        request_id = id(request)
-        _request_body_cache[request_id] = parsed_body
-        
-        # If cache gets too large, remove oldest entries
-        if len(_request_body_cache) > 1000:  # Maximum 1000 cached requests
-            # Remove the oldest 100 entries
-            keys_to_remove = list(_request_body_cache.keys())[:100]
-            for key in keys_to_remove:
-                del _request_body_cache[key]
+        # Store the parsed body directly on the request object
+        # This prevents memory leaks and data cross-contamination since
+        # the data is tied to the specific request object lifecycle
+        setattr(request, "_litellm_parsed_body", parsed_body)
         
     except Exception as e:
         verbose_proxy_logger.debug(