proxy.conf

if ($request_method = 'OPTIONS') {
    add_header 'Access-Control-Allow-Credentials' true;
    add_header 'Access-Control-Allow-Origin' '$http_origin';
    add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, HEAD, OPTIONS';
    add_header 'Access-Control-Allow-Headers' 'token,Authorization,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
    add_header 'Access-Control-Max-Age' 1728000;
    add_header 'Content-Type' 'text/plain; charset=utf-8';
    add_header 'Content-Length' 0;
    return 204;
}

# WebScoket Support start
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
# WebScoket Support end

# 表示使nginx阻止HTTP应答代码为400或者更高的应答
proxy_redirect off;
proxy_intercept_errors on;
proxy_pass_request_headers on;
# 后端的Web服务器可以通过X-Forwarded-For获取用户真实IP
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;
proxy_set_header X-NginX-Proxy true;
# 允许客户端请求的最大单文件字节数
client_max_body_size 500m;
# 缓冲区代理缓冲用户端请求的最大字节数
client_body_buffer_size 1m;
# nginx跟后端服务器连接超时时间(代理连接超时)
proxy_connect_timeout 90;
# 连接成功后，后端服务器响应时间(代理接收超时)
proxy_read_timeout 90;
# 设置代理服务器（nginx）保存用户头信息的缓冲区大小
proxy_buffer_size 4k;
# proxy_buffers缓冲区，网页平均在32k以下的话，这样设置
proxy_buffers 6 32k;
# 高负荷下缓冲大小（proxy_buffers*2）
proxy_busy_buffers_size 64k;
# 设定缓存文件夹大小，大于这个值，将从upstream服务器传
proxy_temp_file_write_size 64k;