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