code: public static MultiValueMap asMultiValueMap(final String key1, final Object value1, final String key2, final Object value2) {
          val wrap = (Map) wrap(key1, wrapList(value1), key2, wrapList(value2));
          return org.springframework.util.CollectionUtils.toMultiValueMap(wrap);
      }
docs: As multi value map.
  
  @param key1   the key 1
  @param value1 the value 1
  @param key2   the key 2
  @param value2 the value 2
  @return the multi value map