[FIXED] request.getRemoteHost() vs request.getHeader("HOST")

Issue

If I will execute request.getRemoteHost() and request.getHeader("HOST") on a Java server will these methods return the same values? According to the documentation yes, but I will be happy for the confirmation: href="https://tomcat.apache.org/tomcat-9.0-doc/servletapi/javax/servlet/ServletRequest.html#getRemoteHost--" rel="nofollow noreferrer">https://tomcat.apache.org/tomcat-9.0-doc/servletapi/javax/servlet/ServletRequest.html#getRemoteHost--

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Host

Solution

1. request.getRemoteHost() : Returns the fully qualified name of the client that sent the request.

   So, If you access it via localhost you would get something like : 0:0:0:0:0:0:0:1. If you access it via some other machine, it will return you the IP address of that machine.

2. request.getHeader("HOST") : Returns the value of the "Host" header in the request.

   So, If you are hitting an application url : https://www.test.com, then request.getHeader("Host") would return you www.test.com

Answered By - Amit kumar
Answer Checked By - Gilberto Lyons (JavaFixing Admin)