MockHttpServletRequest ignoring set fields, how do I get around this?

I am trying to test a servlet filter for a Tomcat application. To do so, I am using the MockHttpServletRequest provided by Spring.

I set it up like this:

MockHttpServletRequest request = new MockHttpServletRequest();
request.setMethod("POST");
request.setRemoteHost("mycompany.com");
request.setRequestURI("/myapp.php");
request.setSecure(true);

but when I the following:

System.out.println(request.getRequestURL());

produces: http://localhost/myapp.php. On the other hand, if I explicitly request one of the fields I set, like:

System.out.println(request.getRemoteHost());

I get: mycompany.com

What's going on here? How can I get getRequestURL to produce what I'm really after: http://ift.tt/18BK6nE