没有代理的情况在商户的前端接入层没有做代理的情况下获取ip的方式比较简单，直接获取'REMOTE_ADDR '即可。

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有代理的情况在有代理的情况下，因为要代替客户端去访问服务器，所以，当请求包经过反向代理后，在代理服务器这里这个IP数据包的IP包头做了修改，最终后端WEB服务器得到的数据包的头部源IP地址是代理服务器的IP地址。这样一来，后端服务器的程序就无法获取用户的真实ip。 nginx有代理的情况: 在nginx中配置中加入 proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Real-Port $remote_port; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; Apache有代理的情况： vi /usr/local/apache/conf/httpd.conf Include conf/extra/httpd-remoteip.conf vi /usr/local/apache/conf/extra/httpd-remoteip.conf LoadModule remoteip_module modules/mod_remoteip.so RemoteIPHeader X-Forwarded-For RemoteIPinternalProxy 127.0.0.1 代码 示例 string GetClientIp(CgiInput* poInput) { string client_ip = ""; string strClientIPList; GetHttpHeader("X-Forwarded-For", strClientIPList); if (strClientIPList.empty()) { GetHttpHeader("X-Real-IP", strClientIPList); } if (!strClientIPList.empty()) { size_t iPos = strClientIPList.find( "," ); if( iPos != std::string::npos ) { client_ip = strClientIPList.substr( iPos ); } else { client_ip = strClientIPList; } } if (client_ip.empty()) { GetHttpHeader("PROXY_FORWARDED_FOR", strClientIPList); // 需进行兼容 if(strClientIPList.empty()) { client_ip = getRemoteAddr(); } else { size_t iPos = strClientIPList.find( "," ); if( iPos != std::string::npos ) { client_ip = strClientIPList.substr( iPos ); } else { client_ip = strClientIPList; } } } if(!MMPayCommFunc::IsIp(client_ip)) client_ip = getRemoteAddr(); return client_ip; }

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