code: public String get(String name) {
      List<String> valuesList = values(name);
      String value = null;
      if (valuesList != null && valuesList.size() > 0) {
        value = valuesList.get(0);
      }
      return value;
    }
docs: Returns the first header value for a given key.
  @param name The name of the header key
  @return the first value for the given key