Replace "/" with "-" in model name when being used as a h11 header name

Author: kayoch1n

litellm/proxy/common_utils/callback_utils.py

@@ -316,18 +316,21 @@ def get_remaining_tokens_and_requests_from_request_data(data: Dict) -> Dict[str,
     headers = {}
     _metadata = data.get("metadata", None) or {}
     model_group = get_model_group_from_request_data(data)
+    
+    # The h11 package considers "/" or ":" invalid and raise a LocalProtocolError
+    h11_model_group_name = model_group.replace('/', '-').replace(':', '-')
 
     # Remaining Requests
     remaining_requests_variable_name = f"litellm-key-remaining-requests-{model_group}"
     remaining_requests = _metadata.get(remaining_requests_variable_name, None)
     if remaining_requests:
-        headers[f"x-litellm-key-remaining-requests-{model_group}"] = remaining_requests
+        headers[f"x-litellm-key-remaining-requests-{h11_model_group_name}"] = remaining_requests
 
     # Remaining Tokens
     remaining_tokens_variable_name = f"litellm-key-remaining-tokens-{model_group}"
     remaining_tokens = _metadata.get(remaining_tokens_variable_name, None)
     if remaining_tokens:
-        headers[f"x-litellm-key-remaining-tokens-{model_group}"] = remaining_tokens
+        headers[f"x-litellm-key-remaining-tokens-{h11_model_group_name}"] = remaining_tokens
 
     return headers