nginx做反向負載均衡，后端服務器獲取真實客戶端ip

nginx做反向負載均衡，后端服務器獲取真實客戶端ip

首先，在前端nginx上需要做如下配置：

location /

proxy_set_hearder host                $host;

proxy_set_header X-forwarded-for $proxy_add_x_forwarded_for;

proxy_set_header X-real-ip           $remote_addr;

};

nginx會在把請求轉向后台real-server前把http報頭中的ip地址進行替換；這樣操作完成后，real-server也需要做一些操作；

 

 可是，如果通過了多級反向代理的話，X-Forwarded-For的值並不止一個，而是一串Ｉｐ值，此時取第一個Ip地址就可以了，相關代碼如下:

 

 

public String getClientIp(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");

        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getHeader("WL-Proxy-Client-IP");

        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

            ip = request.getRemoteAddr();

        }
        if(ip.trim().contains(",")){//為什么會有這一步，因為經過多層代理后會有多個代理，取第一個ip地址就可以了
            String [] ips=ip.split(",");
            ip=ips[0];
        }
        return ip;
    }