How to modify default tomcat http header property "Server: Apache-Coyote/1.1" ?

[Hanks Wang (hanwan)]

Hi all,
 
I deployed a servlet in Tomcat which response to all http post requests,
and I composed the response data by HttpServletResponse object.
 
But I found Tomcat will generate a default http header property in the
response: "Server: Apache-Coyote/1.1"
 
So my question is : Is there a way to change the http header value? eg:
change it to "Server: For-Test"
 
I try to use below method: 
response.setHeader("Server", "For-Test");
 
Then the http header becomes to:
Server: Apache-Coyote/1.1
Server: For-test
 
But the "Apache-Coyote/1.1" still there.  So how can I delete it or
modify it? Thanks!
 
B.R
Han