code: private String[] responseHeaders( final String name ) {
          final Map<String, List<String>> headers = responseHeaders();
          if( headers == null || headers.isEmpty() )
              return EMPTY_STRINGS;
  
          final List<String> values = headers.get(name);
          if( values != null && !values.isEmpty() )
              return values.toArray(new String[values.size()]);
          else
              return EMPTY_STRINGS;
      }
docs: Get all values of the given header from the response
  
  @param name
  @return non-null but possibly empty array of {@link String} header values