fix: handle azure model mapping and exception serialization

This update adds Azure model mapping for both small and big models, and improves error detail serialization for exceptions with non-JSON serializable attributes.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: 2 people

server.py

@@ -251,6 +251,9 @@ def validate_model_field(cls, v, info):  # Renamed to avoid conflict
             if PREFERRED_PROVIDER == "google" and SMALL_MODEL in GEMINI_MODELS:
                 new_model = f"gemini/{SMALL_MODEL}"
                 mapped = True
+            elif PREFERRED_PROVIDER == "azure":
+                new_model = f"azure/{SMALL_MODEL}"
+                mapped = True
             else:
                 new_model = f"openai/{SMALL_MODEL}"
                 mapped = True
@@ -260,6 +263,9 @@ def validate_model_field(cls, v, info):  # Renamed to avoid conflict
             if PREFERRED_PROVIDER == "google" and BIG_MODEL in GEMINI_MODELS:
                 new_model = f"gemini/{BIG_MODEL}"
                 mapped = True
+            elif PREFERRED_PROVIDER == "azure":
+                new_model = f"azure/{BIG_MODEL}"
+                mapped = True
             else:
                 new_model = f"openai/{BIG_MODEL}"
                 mapped = True
@@ -329,6 +335,9 @@ def validate_model_token_count(cls, v, info):  # Renamed to avoid conflict
             if PREFERRED_PROVIDER == "google" and SMALL_MODEL in GEMINI_MODELS:
                 new_model = f"gemini/{SMALL_MODEL}"
                 mapped = True
+            elif PREFERRED_PROVIDER == "azure":
+                new_model = f"azure/{SMALL_MODEL}"
+                mapped = True
             else:
                 new_model = f"openai/{SMALL_MODEL}"
                 mapped = True
@@ -338,6 +347,9 @@ def validate_model_token_count(cls, v, info):  # Renamed to avoid conflict
             if PREFERRED_PROVIDER == "google" and BIG_MODEL in GEMINI_MODELS:
                 new_model = f"gemini/{BIG_MODEL}"
                 mapped = True
+            elif PREFERRED_PROVIDER == "azure":
+                new_model = f"azure/{BIG_MODEL}"
+                mapped = True
             else:
                 new_model = f"openai/{BIG_MODEL}"
                 mapped = True
@@ -1553,7 +1565,13 @@ async def create_message(request: MessagesRequest, raw_request: Request):
         # Check for LiteLLM-specific attributes
         for attr in ["message", "status_code", "response", "llm_provider", "model"]:
             if hasattr(e, attr):
-                error_details[attr] = getattr(e, attr)
+                value = getattr(e, attr)
+                # Convert non-JSON serializable objects to strings
+                try:
+                    json.dumps(value)
+                    error_details[attr] = value
+                except (TypeError, ValueError):
+                    error_details[attr] = str(value)
 
         # Check for additional exception details in dictionaries
         if hasattr(e, "__dict__"):