map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
        server_name docs.mydomain.com;
        listen 443 ssl;
        listen 8443 ssl;
        http2 on;

        access_log /var/log/nginx/docs.mydomain.com_access_log main;
        error_log /var/log/nginx/docs.mydomain.com_error_log info;

        proxy_buffering off;

    location / {
                proxy_pass http://127.0.0.1:2276/;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";

                proxy_redirect off;
                proxy_set_header Host $host:$server_port;
                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 $server_name;
                proxy_set_header X-Forwarded-Proto $scheme;
                add_header Referrer-Policy "strict-origin-when-cross-origin";
    }

    include com.mydomain/certbot.conf;
}