关于nginx:Nginx-proxysetheader设置

nginx代理罕用配置项

 server {
        listen       80;
        server_name  localhost;
        location /test119 {
                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_pass http://192.168.4.120:80;
        }

通过以下的案例来了解proxy_set_header设置

其中backend 192.168.4.122 提前装置nginx 第三方模块反对 “”echo”

=============192.168.4.119 proxy1 nginx.conf

 server {
        listen       80;
        server_name  localhost;
        location /test119 {
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_pass http://192.168.4.120:80;
        }

=============192.168.4.120 proxy2 nginx.conf

server {
        listen       80;
        server_name  localhost;
        location /test {
                proxy_pass http://192.168.4.121:80;
        }

=============192.168.4.121 proxy3 nginx.conf

server {
        listen       80;
        server_name  localhost;
        location /test {
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_pass http://192.168.4.122:80;
        }

=============192.168.4.122 backend nginx.conf

server {
        listen       80;
        server_name  localhost;
        location /test {
             default_type text/html;
             charset gbk;
             echo "$remote_addr ||$http_x_real_ip  ||$http_x_forwarded_for"
        }

在192.168.44.254 上拜访 [http://192.168.4.119/test119](http://192.168.4.119/test119)

192.168.4.121 ||192.168.4.254 ||192.168.4.254, 192.168.4.120

有留神到 ||192.168.4.254, 192.168.4.120 是不蕴含192.168.4.119

proxy_set_header Host $host;
本案例因为不波及到域名所以用不到$Host值,作用也比拟好了解,就是nginx做代理时,把原http申请的Header中的Host字段也放到转发的申请里,如果不加这一行的话,nginx转发的申请header里就不会有Host字段,而服务器是靠这个Host值来辨别你的申请的是哪个域名的资源的,

proxy_set_header X-Real-IP $remote_addr;
只能获取到与服务器自身直连的下层申请ip 写入到http申请头中

proxy_set_header X-Real-IP $proxy_add_x_forwarded_for;
定义客户端IP,如果多层代理都有配置这个值,离backent最近的会笼罩之前的值 所以个别只在连贯客户端的代理上写增加这条值,这样backend就能获取到客户端的实在IP,独自应用有效

proxy_set_header X-Forwarded-For $http_x_forwarded_for;
把客户端IP写入到http申请头中,前提是之前有X-Real-IP $remote_addr定义过客户端IP,所以独自应用有效

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
相当于 $http_x_forwarded_for 和 $remote_addr和联合 获取下层IP和把客户端IP写入申请头中,