nginx转发后后端怎么获取用户真实IP
经常有需求要获取访问用户的IP，在经过nginx转发后真实IP就被隐藏起来了，我们需要在头部信息里拿真实IP,下面是拿IP的代码，考虑了各种情况。
public static String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader("x-real-ip");
if (ip == null || ip.length() == 0
|| "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("x-forwarded-for");
if (ip != null) {
ip = ip.split(",")[0].trim();
}
}
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();
}
return ip;
}但是后面还是一直拿不到真实的IP,基本上拿到的都是127.0.0.1 后面我把请求头都输出来了 我们在控制台把所有请求头输出来看看 获取请求头代码
Enumeration<String> h = request.getHeaderNames();
while(h.hasMoreElements()){
String n = h.nextElement();
System.out.println(n+"==="+request.getHeader(n));
}输出结果如下
host===127.0.0.1:8080
connection===close
cache-control===max-age=0
upgrade-insecure-requests===1
user-agent===Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36
accept===text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
referer===http://cxytiandi.com/navigation
accept-encoding===gzip, deflate, sdch
accept-language===zh-CN,zh;q=0.8发现确实真实IP没有被带过来，我用的是nginx的默认配置，是不会带过来的。
需要添加转发的配置，将用户真实的IP设置到请求头中，然后带过来。
在nginx.conf中的location中增加如下代码：
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $host;然后再次请求就能看到输出的请求头的信息就多了一个x-forwarded-for。 真实IP被带过来了。
x-forwarded-for===124.15.252.240
host===cxytiandi.com
connection===close
cache-control===max-age=0
upgrade-insecure-requests===1
user-agent===Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36
accept===text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
referer===http://cxytiandi.com/navigation
accept-encoding===gzip, deflate, sdch
accept-language===zh-CN,zh;q=0.8本文参与 腾讯云自媒体分享计划，分享自微信公众号。
原始发表：2016-11-09，如有侵权请联系 cloudcommunity@tencent.com 删除
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