Update app.py

app.py

@@ -27,7 +27,7 @@ def read_root():
 async def extract_features(file: UploadFile = File(...)):
     try:
         # Validate file format
-        if  not in ["image/jpeg", "image/png", "image/jpg"]:
+        if file.content_type not in ["image/jpeg", "image/png", "image/jpg"]:
             raise HTTPException(status_code=400, detail=f"Unsupported file format. Upload a JPEG or PNG image. Received {file.content_type}")
         
         # Read image