code: @Test public void testResponseConnControlEntityUnknownContentLength() throws Exception {
    HttpContext context=new BasicHttpContext(null);
    BasicHttpRequest request=new BasicHttpRequest("GET","/");
    request.addHeader(new BasicHeader(HTTP.CONN_DIRECTIVE,HTTP.CONN_KEEP_ALIVE));
    context.setAttribute(ExecutionContext.HTTP_REQUEST,request);
    HttpResponse response=new BasicHttpResponse(HttpVersion.HTTP_1_1,HttpStatus.SC_OK,"OK");
    BasicHttpEntity entity=new BasicHttpEntity();
    response.setEntity(entity);
    ResponseConnControl interceptor=new ResponseConnControl();
    interceptor.process(response,context);
    Header header=response.getFirstHeader(HTTP.CONN_DIRECTIVE);
    Assert.assertNotNull(header);
    Assert.assertEquals(HTTP.CONN_CLOSE,header.getValue());
  }
  