Update chat.py

chat.py

@@ -1,11 +1,12 @@
 from fastapi import APIRouter, Request, HTTPException, Depends
-from fastapi.responses import JSONResponse
+from fastapi.responses import JSONResponse, StreamingResponse
 from datetime import datetime
 from bson.objectid import ObjectId
 from huggingface_hub import InferenceClient
 from sentence_transformers import SentenceTransformer
 from sklearn.metrics.pairwise import cosine_similarity
 import re
+import json
 
 from auth import get_current_user
 from database import get_db