Дмитрий

server {
    listen       80;
    server_name  data.exemple.com;

    if ($http_host ~ "(?i)(data\.exemple\.com)$") {
	rewrite ^(.*)  /web/$1 last;
    }

    location /web// {
	proxy_pass http://data.exemple.com;
	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 $server_name;
	proxy_read_timeout 500;
    }

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}

server {
    listen      443;

    ssl on;
    ssl_certificate         /etc/nginx/conf.d/cert/mail.crt;
    ssl_certificate_key     /etc/nginx/conf.d/cert/mail.key;
    ssl_protocols         TLSv1 TLSv1.1 TLSv1.2;
    server_name  mx.example.com;

    #charset koi8-r;
    #access_log  /var/log/nginx/log/host.access.log  main;

    if ($http_host ~ "(?i)(mx\.example\.com)$") {
	rewrite ^(.*)  /web/$1 last;
    }

    location /web// {
	proxy_pass https://mx.example.com;
	proxy_redirect     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 $server_name;
	proxy_read_timeout 500;
    }

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}