code: @Test public void testResponseServerNotGenerated() throws Exception {
    HttpContext context=new BasicHttpContext(null);
    HttpResponse response=new BasicHttpResponse(HttpVersion.HTTP_1_1,HttpStatus.SC_OK,"OK");
    response.getParams().setParameter(CoreProtocolPNames.ORIGIN_SERVER,"some server");
    response.addHeader(new BasicHeader(HTTP.SERVER_HEADER,"whatever"));
    ResponseServer interceptor=new ResponseServer();
    interceptor.process(response,context);
    Header h1=response.getFirstHeader(HTTP.SERVER_HEADER);
    Assert.assertNotNull(h1);
    Assert.assertEquals("whatever",h1.getValue());
  }
  