code: @Test public void testResponseContentOverwriteHeaders() throws Exception {
    ResponseContent interceptor=new ResponseContent(true);
    HttpContext context=new BasicHttpContext(null);
    HttpResponse response=new BasicHttpResponse(HttpVersion.HTTP_1_1,HttpStatus.SC_OK,"OK");
    response.addHeader(new BasicHeader(HTTP.CONTENT_LEN,"10"));
    response.addHeader(new BasicHeader(HTTP.TRANSFER_ENCODING,"whatever"));
    interceptor.process(response,context);
    Assert.assertEquals("0",response.getFirstHeader(HTTP.CONTENT_LEN).getValue());
    Assert.assertEquals("whatever",response.getFirstHeader(HTTP.TRANSFER_ENCODING).getValue());
  }
  