code: static int getIndex(byte[] name) {
      String nameString = new String(name, 0, name.length, ISO_8859_1);
      Integer index = STATIC_INDEX_BY_NAME.get(nameString);
      if (index == null) {
        return -1;
      }
      return index;
    }
docs: Returns the lowest index value for the given header field name in the static table.
  Returns -1 if the header field name is not in the static table.