code: public static Prefer ofInclude(final String... includes) {
          final List<String> iris = asList(includes);
          if (iris.isEmpty()) {
              return valueOf(join("=", PREFER_RETURN, PREFER_REPRESENTATION));
          }
          return valueOf(join("=", PREFER_RETURN, PREFER_REPRESENTATION) + "; " + PREFER_INCLUDE + "=\"" +
                  iris.stream().collect(joining(" ")) + "\"");
      }
docs: Build a Prefer object with a set of included IRIs.
  
  @param includes the IRIs to include
  @return the Prefer object