WSS connection error of OnlyOffice

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I wrote an nginx proxy as follows: However, the WSS error is not resolved. If not, what else should I doubt?

	location / {
		proxy_pass http://localhost:8880;
		proxy_set_header Host $host;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $scheme;
	}

	location ~ /websocket$ {
		proxy_pass http://localhost:8880;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection "upgrade";
	}