source: class HeaderUtilsTest {
  
      @Test
      public void whenHeaderRetryAfterIsAlphabeticalThenParsingFailsSilently() {
  
target:         // Given a retry_after header that contains an alphabetical value
          Header header = new Header(HeaderConstants.HEADER_RETRY_AFTER, "2.1a");
  
          // Given a response
          Response response = new Response(new Request());
  
          // When I copy the retry_after header to the response
          HeaderUtils.copyResponseTransportHeaders(new Series<>(Header.class, Collections.singletonList(header)), response);
  
          // Then the response does not contain a retry_after header
          assertNull(response.getRetryAfter());
      }
  
  }