update cors

main.py

@@ -2,6 +2,7 @@ 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
@@ -10,7 +11,7 @@ app = FastAPI()
 
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["*"],
+    allow_origins=[environ["HOST"]],
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],