Return proper empty response

server/app.py

@@ -4,7 +4,7 @@ import itertools
 from typing import List, Union
 from enum import Enum
 
-from fastapi import FastAPI, status
+from fastapi import FastAPI, status, Response
 from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel
 import aiosqlite
@@ -94,3 +94,4 @@ async def set_availability(body: Availability):
             )
         await db.commit()
     LAST_UPDATE = datetime.datetime.now()
+    return Response(status_code=status.HTTP_204_NO_CONTENT)