default.conf

server {
    listen 80;
    charset utf-8;

    auth_basic "Restricted";
    auth_basic_user_file /etc/nginx/.htpasswd;

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

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

nginx.conf

user nginx;
worker_processes auto;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;

events {
    worker_connections 65535;
    multi_accept on;
    use epoll;
}

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

    log_format ltsv 'time:$time_iso8601\t'
                    'remote_addr:$remote_addr\t'
                    'request_method:$request_method\t'
                    'request_length:$request_length\t'
                    'request_uri:$request_uri\t'
                    'https:$https\t'
                    'uri:$uri\t'
                    'query_string:$query_string\t'
                    'status:$status\t'
                    'bytes_sent:$bytes_sent\t'
                    'body_bytes_sent:$body_bytes_sent\t'
                    'referer:$http_referer\t'
                    'useragent:$http_user_agent\t'
                    'forwardedfor:$http_x_forwarded_for\t'
                    'request_time:$request_time\t'
                    'upstream_response_time:$upstream_response_time\t'
                    'upstream_addr:$upstream_addr';

    access_log  /var/log/nginx/access.log  ltsv;

    sendfile   on;
    tcp_nopush on;

    keepalive_timeout 30;

    gzip  on;

    # hide version info
    server_tokens off;

    # response 304 depend on If-Modified-Since header
    if_modified_since before;

    include /etc/nginx/conf.d/*.conf;
}