目标：
利用nginx实现server_ip:8080 代理 server_ip:8000
获取真实的访问者IP

1. 修改nginx配置文件

在location ~ {}的大括号内添加如下参数

proxy_set_header Host $host:8080;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header REMOTE-HOST $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

2. flask代码

将request.remote_addr修改为request.headers['X-Real-Ip']

@flask_login.user_logged_in.connect_via(app)
def _track_logins(sender, user, **extra):
    user.login_count += 1
    #user.login_ip = request.remote_addr
    user.login_ip = request.headers['X-Real-Ip']
    db.session.add(user)
    db.session.commit()

3. 可以尝试查看请求headers头信息

在flask代码中添加print request.headers

X-Real-Ip: 10.0.1.166
Content-Length: 
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:50.0) Gecko/20100101 Firefox/50.0
Connection: Keep-Alive
Remote-Host: 10.0.1.166
Host: 172.16.3.9
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Proxy-Connection: Keep-Alive
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
X-Forwarded-For: 10.0.1.166
Content-Type: 
Accept-Encoding: gzip, deflate

4. 完整nginx配置文件

events

{

  worker_connections  1024;

}

http{
client_max_body_size 100m;


proxy_cache_path  /tmp/threat levels=1:2 keys_zone=cache1:80m max_size=10000m inactive=60000m;

server_tokens off;

upstream backserver {

  server 127.0.0.1:8080;

  keepalive 15;

}

log_format proxy_combined '$remote_addr [$time_local] "$request" $status $body_bytes_sent $request_time "$upstream_cache_status"';

log_format timed_combined '$http_x_forwarded_for $remote_addr - $remote_user [$time_local] '
    '"$request" $status $body_bytes_sent '
    '"$http_referer" "$http_user_agent" '
    '$request_time $upstream_response_time $pipe';

server {

  listen 8080;
            client_body_buffer_size  128k;
            proxy_connect_timeout    600;
            proxy_read_timeout       600;
            proxy_send_timeout       6000;

  add_header X-Cache $upstream_cache_status;

#不缓存/login页面
  location =/login{
        proxy_pass http://127.0.0.1:8000;
        proxy_http_version 1.1;
        #proxy_set_header Connection "Keep-Alive";
        #proxy_set_header Proxy-Connection "Keep-Alive";
        access_log /var/log/nginx/proxy_access.log proxy_combined;
        proxy_set_header Host $host:8080;
        proxy_set_header X-Real-Ip $remote_addr;
        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  }


  location ~ {
        proxy_cache cache1;
        proxy_cache_valid 200 302 5d;
        proxy_cache_methods GET HEAD POST;
        proxy_cache_key "$request_uri|$request_body";
#只缓存当前访问IP访问过的页面，其他IP访问该页面不缓存
#proxy_cache_key "$remote_addr|$request_uri|$request_body";
        proxy_pass http://127.0.0.1:8000;
        proxy_http_version 1.1;
        #proxy_set_header Connection "Keep-Alive";
        #proxy_set_header Proxy-Connection "Keep-Alive";
        access_log /var/log/nginx/proxy_access.log proxy_combined;
        proxy_set_header Host $host:8080;
        proxy_set_header X-Real-Ip $remote_addr;
        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  }

}
}