nginx убрать слэш в конце при редиректе при proxy pass на бэкэнд/nginx remove the trailing slash

location /
}
error_page 503 /50x.html;
location = /50x.html {
root /usr/share/nginx/html/error;
internal;
}
rewrite ^/(.*)/$ /$1 permanent;
proxy_pass http://backend;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
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;
proxy_connect_timeout 600;
proxy_send_timeout 600;
proxy_read_timeout 600;
send_timeout 600;
}