}

  /**
   * Returns the name of the query parameter at `index`. For example this returns `"a"`
   * for `queryParameterName(0)` on `http://host/?a=apple&b=banana`. This throws if
   * `index` is not less than the [query size][querySize].
   *
   * | URL                               | `queryParameterName(0)` | `queryParameterName(1)` |
   * | :-------------------------------- | :---------------------- | :---------------------- |