public Map<String, String> getHeaders()
  {
    return _headers;
  }
@Test
  public void testHeadersCaseInsensitiveGet()
  {
    final long id = 42l;
    GetRequestBuilder<Long, TestRecord> builder = generateDummyRequestBuilder();
    Request<TestRecord> request = builder.id(id).addHeader("header", "value").build();
    Assert.assertEquals(request.getHeaders().get("HEADER"), "value");
  }