remove more nesting

backend/main.py

@@ -680,26 +680,26 @@ class ChatCompletionMiddleware(BaseHTTPMiddleware):
         ]
 
         response = await call_next(request)
-        if isinstance(response, StreamingResponse):
-            content_type = response.headers["Content-Type"]
-            is_openai = "text/event-stream" in content_type
-            is_ollama = "application/x-ndjson" in content_type
-            if not is_openai and not is_ollama:
-                return response
+        if not isinstance(response, StreamingResponse):
+            return response
 
-            def wrap_item(item):
-                return f"data: {item}\n\n" if is_openai else f"{item}\n"
+        content_type = response.headers["Content-Type"]
+        is_openai = "text/event-stream" in content_type
+        is_ollama = "application/x-ndjson" in content_type
+        if not is_openai and not is_ollama:
+            return response
 
-            async def stream_wrapper(original_generator, data_items):
-                for item in data_items:
-                    yield wrap_item(json.dumps(item))
+        def wrap_item(item):
+            return f"data: {item}\n\n" if is_openai else f"{item}\n"
 
-                async for data in original_generator:
-                    yield data
+        async def stream_wrapper(original_generator, data_items):
+            for item in data_items:
+                yield wrap_item(json.dumps(item))
 
-            return StreamingResponse(stream_wrapper(response.body_iterator, data_items))
+            async for data in original_generator:
+                yield data
 
-        return response
+        return StreamingResponse(stream_wrapper(response.body_iterator, data_items))
 
     async def _receive(self, body: bytes):
         return {"type": "http.request", "body": body, "more_body": False}