upstream docservice {
    server 127.0.0.1:3333;
}

map $http_host $this_host {
    "" $host;
    default $http_host;
}

map $http_x_forwarded_proto $the_scheme {
    default $http_x_forwarded_proto;
    "" $scheme;
}

map $http_x_forwarded_host $the_host {
    default $http_x_forwarded_host;
    "" $this_host;
}

map $http_upgrade $proxy_connection {
    default upgrade;
    "" close;
}

proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $proxy_connection;
proxy_set_header X-Forwarded-Host $the_host;
proxy_set_header X-Forwarded-Proto $the_scheme;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

server {
    listen 0.0.0.0:443 ssl;
    server_name office.grenu4.ru;
    server_tokens off;
    root /var/www/html;

    ssl_certificate /etc/letsencrypt/live/office.grenu4.ru/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/office.grenu4.ru/privkey.pem;
    ssl_verify_client off;

    ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_session_cache builtin:1000 shared:OnSSL:10m;

    ssl_prefer_server_ciphers on;

    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Content-Type-Options nosniff;

    location / {
        proxy_pass http://docservice;
        proxy_http_version 1.1;
    }
}