My Nginx.conf

user www-data;
worker_processes 2;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
    # multi_accept on;
}

http {

    ##add limit connection by IP...
    limit_conn_zone  $binary_remote_addr  zone=limitC1:3m;
    limit_conn_log_level notice;

    ##limit request by ip
    limit_req_zone  $binary_remote_addr  zone=limitR1:3m   rate=20r/s;
    limit_req_log_level notice;

    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    server_tokens off;
    client_body_temp_path /var/lib/nginx/body 1 2;

    # 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_vary on;
    # gzip_proxied any;
    # gzip_comp_level 6;
     gzip_buffers 32 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;

    ## Size Limits
    client_body_buffer_size 128k;
    client_header_buffer_size 64k;
    client_max_body_size 10M;
    large_client_header_buffers 1 1k;

    ##
    # 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;

    ##########
    ##http://wordpress.org/extend/plugins/nginx-proxy-cache-integrator/installation/
    proxy_cache_path  /var/lib/nginx/cache  levels=1:2   keys_zone=staticfilecache:50m  max_size=200m;
    proxy_temp_path /var/lib/nginx/proxy;
    proxy_connect_timeout 30;
    proxy_read_timeout 120;
    proxy_send_timeout 120;
    #IMPORTANT - this sets the basic cache key that's used in the static file cache.
    proxy_cache_key "$scheme://$host$request_uri";
    #########
    proxy_buffer_size   16k;
    proxy_buffers       32   16k;
    proxy_busy_buffers_size 64k;
    #########
    ##
    # Virtual Host Configs
    ##

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