How to get host name with port from a http or https request

Question

I have two applications deployed in jboss container(same unix box). If i get a request from app1, i need to frame a corresponding request for app2.

eg:

Answer 1

If you use the load balancer & Nginx, config them without modify code.

Nginx:

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_set_header X-Forwarded-Proto  $scheme;  

Tomcat's server.xml Engine:

If only modify Nginx config file, the java code should be:

String XForwardedProto = request.getHeader("X-Forwarded-Proto");