update cors

main.py

@@ -1,22 +1,12 @@
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
-from fastapi.middleware.cors import CORSMiddleware
 from socketio import ASGIApp
-from os import environ
 
 import back
 import front
 
 app = FastAPI()
 
-app.add_middleware(
-    CORSMiddleware,
-    allow_origins=[environ["HOST"]],
-    allow_credentials=True,
-    allow_methods=["*"],
-    allow_headers=["*"],
-)
-
 router, sio = back.get_backend()
 app.include_router(router)
 app.include_router(front.get_frontend())