user  root;
worker_processes  4;
#error_log  logs/error.log  info;
events {
    worker_connections  1024;
    use epoll;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    tcp_nopush     on;
    keepalive_timeout  65;
    server_names_hash_bucket_size 128;
    client_header_buffer_size 32k;
    large_client_header_buffers 4 32k;
    client_max_body_size 300m;
    proxy_redirect off;
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_connect_timeout 90;
    proxy_send_timeout 90;
    proxy_read_timeout 90;
    proxy_buffer_size 16k;
    proxy_buffers 4 64k;
    proxy_busy_buffers_size 128k;
    proxy_temp_file_write_size 128k;

    # 更新日志格式
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for" '
                      '"$upstream_addr"';

    #include  ./conf.d/*.conf;

    #upstream start
    upstream fdfs_uenpay {
      server 10.10.31.252:8888 weight=100 max_fails=2 fail_timeout=10s;
      server 10.10.21.124:8089 weight=1 max_fails=2 fail_timeout=10s;
    }
    #upstream end

    #server start
    server {
        listen       80;
        listen       [::]:80 default_server;
        server_name  _;
        access_log  /var/log/nginx/access.log  main;
        error_log  /var/log/nginx/error.log  info;

        location ^~ /uenpay {
            proxy_next_upstream http_502 http_504 http_404 error timeout invalid_header;
            proxy_cache_valid 200 304 12h;
            proxy_cache_key $uri$is_args$args;
            add_header 'Access-Control-Allow-Origin' $http_origin;
            add_header 'Access-Control-Allow-Credentials' 'true';
            add_header "Access-Control-Allow-Methods" "GET, POST, HEAD, PUT, DELETE, OPTIONS, PATCH";
            add_header "Access-Control-Allow-Headers" "Origin, No-Cache, Authorization, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type";

            if ($request_method = 'OPTIONS') {
                return 200 'OK';
            }

            # 设置传递给后端的头信息，以便日志中可以记录后端服务器地址
            proxy_set_header X-Backend-Server $upstream_addr;

            proxy_pass http://fdfs_uenpay;
        }

    }
    #server end    
}