Master nginx confs.

app.conf

#-----------------------------------------------------------
# If using a proxy server

upstream app{
  #server unix:///app_path/shared/sockets/app.sock fail_timeout=0;
  server unix:///app_path/shared/sockets/app.sock;
}

#------------------------------------------------------------


server {
    listen 80 default;
    server_name example.com www.example.com;
    set $app_root /apps/app_name    

    # Set to document root
    root $app_root/current/public;
    index index.html index.htm;

    keepalive_timeout 5;

    access_log $app_root/shared/log/nginx_access.log;
    error_log $app_root/shared/log/nginx_error.log;
    rewrite_log on;

    error_page 502 503 /502.html;
    error_page 500 /500.html;
    error_page 404 /404.html;

    location ~* \.(ico|css|js|gif|jpe?g|png|svg)(\?[0-9]+)?$ {
        expires max;
        break;
    }

    # 200mb upload max

    client_max_body_size 200M;

    # Rewrite non www
    
    if ($host ~* www\.(.*)) {
        set $host_without_www $1;
        rewrite ^(.*)$ https://$host_without_www$1 permanent;
    }

    # Show a maintenance page if one exists.
    
    if (-f $document_root/system/maintenance.html) {
        rewrite ^(.*)$ /system/maintenance.html break;
    }

    try_files $uri $uri/index.html @backend;

    location @backend {
        proxy_pass http://app;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_redirect off;
    }
}

nginx.conf

user www-data;
worker_processes 8;
worker_rlimit_nofile 30000;

timer_resolution  500ms;

pid /run/nginx.pid;

events {
	use epoll;
	worker_connections 30000;
	# multi_accept on;
}

http {

	##
	# Basic Settings
	##

	sendfile on;
	tcp_nopush on;
	
	# changes below

	tcp_nodelay off;
	
	# added	
	client_body_timeout   10;
	client_header_timeout 10;
	client_header_buffer_size 128;

	open_file_cache           max=1000 inactive=20s;
	open_file_cache_valid     30s;
	open_file_cache_min_uses  2;
	open_file_cache_errors    on;	
	
	proxy_buffer_size           32k;
	proxy_buffers               4 32k;
	proxy_busy_buffers_size     32k;
	proxy_temp_file_write_size  32k;
	
	# end changes

	keepalive_timeout 65;
	types_hash_max_size 2048;
	server_tokens off;

	# server_names_hash_bucket_size 64;
	server_name_in_redirect off;

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

	##
	# Logging Settings
	##

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

	##
	# Gzip Settings
	##

	gzip on;
	gzip_disable "msie6";

	# gzip changes

	gzip_http_version 1.0;

        gzip_buffers    4 16k;
        gzip_comp_level 2;
        gzip_min_length 0;

        gzip_types    text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;
        gzip_proxied  expired no-cache no-store private auth;


	# end changes


	# 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/x-javascript text/xml application/xml application/xml+rss text/javascript;

	##
	# nginx-naxsi config
	##
	# Uncomment it if you installed nginx-naxsi
	##

	#include /etc/nginx/naxsi_core.rules;

	##
	# nginx-passenger config
	##
	# Uncomment it if you installed nginx-passenger
	##
	
	#passenger_root /usr;
	#passenger_ruby /usr/bin/ruby;

	##
	# Virtual Host Configs
	##

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