Tomcat obtains the client domain name of Nginx reverse proxy

question

After Nginx reverse proxy, the Tomcat application obtains the Nginx host through request.getHeader("host") , not the real domain name in the client browser address bar.

For example, on a certain server, Tomcat's port number is 8080, Nginx's port number is 80, and Nginx reverse proxy is port 8080.

server {
  listen 80;
  location / {
    proxy_pass http://127.0.0.1:8080;
  }
}

On another machine, use a browser to open http://haha/test to access the application under Tomcat and obtain the client domain name.

System.out.println(request.getHeader("host"));

turn out:

localhost:8080

Causes of the problem

Nginx's reverse proxy is actually a bridge between the client and the real application server. The client (usually a browser) accesses the Nginx server, and Nginx then accesses the Web application server. For the Web application, the client of this HTTP request is Nginx rather than the real client browser. If no special processing is done, the Web application will regard Nginx as the request client, and the client information obtained is some information about Nginx.

Problem Solving

Nginx configures HTTP Header. Host contains the client's real domain name and port number

proxy_set_header Host $http_host;

Tomcat obtains client information from the HTTP Header passed by Nginx.

<Valve className="org.apache.catalina.valves.RemoteIpValve" />

Summarize

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