本地用tomcat起了一個j2ee的應用,然後又起了一個nginx做反向代理。
nginx.conf:
#user nobody;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server {
listen 50001;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
root html;
index index.html index.htm;
}
location /ly {
proxy_pass http://127.0.0.1:8080/hello.do;
proxy_set_header Host $host;
proxy_set_header X-real-ip $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
include servers/*;
}
這裏配置了nginx的監聽端口爲50001。使用了proxy_set_header來配置nginx轉發的頭部操作。其中如下配置就是針對xff的:
其中$proxy_add_x_forwarded_for變量的值是當前包的x-forwarded-for變量和remote-addr變量,使用逗號隔開。所以上面的命令就是把當前的包的x-forwarded-for的值設置爲x-forwarded-for和remote-addr的連接。這樣這個包轉發給下游時,下游就有了這臺nginx服務器的ip地址。
當client第一次請求nginx服務器時,nginx拿到的x-forwarded-for爲null,remote-addr就是client的實際地址,所以第一次的轉發的xff值就只有client的ip地址,轉發的nginx的地址是在remote-addr裏。下一臺nginx服務器會把第一臺nginx服務器的地址填入xff。所以當一臺服務器收到一個包時,上一臺服務器的地址並不在xff裏面,必須通過remote-addr拿到。
Controller:
public class MainController extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out = response.getWriter();
out.println("NGINX FORWARD");
String ssfAddr = request.getHeader("X-Forwarded-For");
String realIp = request.getHeader("X-Real-IP");
String remoteAddr = request.getRemoteAddr();
System.out.println("X-Forwarded-For: " + ssfAddr);
System.out.println("X-Real-IP: " + realIp);
System.out.println("remoteAddr: " + remoteAddr);
}
}
本地ip爲192.168.43.33。
然後我先使用了手機訪問了nginx域名:192.168.43.33:50001/ly
顯示:
X-Forwarded-For: 192.168.43.1
X-Real-IP: 192.168.43.1
remoteAddr: 127.0.0.1
這裏192.168.43.1是手機的ip,127.0.0.1是nginx的ip。且通過x-real-ip可以獲取到真實ip。
在使用一個crul命令:
curl http://localhost:50001/ly -H 'X-Forwarded-For: unkonw, <8.8.8.8> 1.1.1.1' -H 'X-Real-IP: 2.2.2.2'
顯示:
X-Forwarded-For: unkonw, <8.8.8.8> 1.1.1.1, 127.0.0.1
X-Real-IP: 127.0.0.1
remoteAddr: 127.0.0.1
這裏客戶端就是本機,所以會在xff後面添加一個127.0.0.1。也是符合預期的。