nginx reverse proxy

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
    worker_connections 768;
    # multi_accept on;
}

http {

    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    # server_tokens off;

        # Directives for setting real_ip/XFF IP address in log files
        set_real_ip_from    xxx.xxx.xxx.xxx; #IP address of master LB
        set_real_ip_from    xxx.xxx.xxx.xxx; #IP Address of slave LB
        set_real_ip_from    127.0.0.1; #IP Address of localhost IPV4
        set_real_ip_from    ::1; #IP Address of localhost IPV6
        real_ip_header      X-Forwarded-For;

    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    ##
    # SSL Settings
    ##

    #ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
    #ssl_prefer_server_ciphers on;
        # ssl config
        # c.f. https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
        # c.f. https://mozilla.github.io/server-side-tls/ssl-config-generator/
        ssl_session_cache shared:SSL:50m;
        ssl_session_timeout 60m;

        # modern
        ssl_protocols TLSv1.2;
        ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';

        ssl_prefer_server_ciphers on;
        ssl_session_tickets off;


        # security
        # HSTS (ngx_http_headers_module is required) (15768000 seconds = 6 months)
        add_header Strict-Transport-Security max-age=15768000;

        # generic proxy settings
        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-Proto $scheme;

        # pages may need longer to produce output - this should somewhat correspond to the proxied server timeout
        proxy_read_timeout 400s;


        ##
    # Logging Settings
    ##

        log_format  main  '$http_x_forwarded_for - $remote_user [$time_local] "$request" '
                          '$status $body_bytes_sent "$http_referer" '
                          '"$http_user_agent"';

    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log;

    ##
    # Gzip Settings
    ##

    gzip on;

    # gzip_vary on;
    # gzip_proxied any;
    # gzip_comp_level 6;
    # gzip_buffers 16 8k;
    # gzip_http_version 1.1;
    # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    ##
    # Virtual Host Configs
    ##

    include /etc/nginx/conf.d/*.conf;
        #include /etc/nginx/passthrough.conf;
    include /etc/nginx/sites-enabled/*;
}

        include /etc/nginx/passthrough.conf;

#mail {
#   # See sample authentication script at:
#   # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#   # auth_http localhost/auth.php;
#   # pop3_capabilities "TOP" "USER";
#   # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
#   server {
#       listen     localhost:110;
#       protocol   pop3;
#       proxy      on;
#   }
#
#   server {
#       listen     localhost:143;
#       protocol   imap;
#       proxy      on;
#   }
#}