jenkins + nginx proxy (JENKINS_ARGS=--prefix=/jenkins)

jenkins.conf

server {
    listen 80 default_server;
    server_name dev.example.com;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl default_server;
    server_name dev.example.com;
    ssl_certificate /etc/letsencrypt/live/dev.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/dev.example.com/privkey.pem;
    add_header Strict-Transport-Security max-age=15768000;
    if ($host != "dev.example.com") {
      return 403;
    }
    location / {
        return 403;
    }
    location ^~ /jenkins {
        proxy_pass http://localhost:8080;

        sendfile off;
        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-Host     $host;
        proxy_set_header   X-Forwarded-Proto    $scheme;
        
        client_max_body_size       10m;

        proxy_connect_timeout      90;
        proxy_send_timeout         90;
        proxy_read_timeout         90;
    }
}