Nginx反向代理504网关超时

Question

我具有以下启用了certbot auto ssl认证的nginx配置。我面临的问题是不时出现。我收到 504网关超时。 我尝试增加超时时间，但这没有用。我还设置了其中一种解决方案中提到的 proxy_set_header连接“” ，但是它不起作用。有人知道问题出在哪里吗？

server {
    index index.html;
    server_name testdomain.fr www.testdomain.fr;
    proxy_connect_timeout 600;
    proxy_send_timeout 600;
    proxy_read_timeout 600;
    send_timeout 600;


    location / {
        proxy_pass http://localhost:5000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'keep-alive';
        proxy_set_header Host $http_host;
        proxy_cache_bypass $http_upgrade;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
        proxy_busy_buffers_size 256k;

    }


    #listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen *:443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/testdomain.fr/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/testdomain.fr/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}