*
 * ## Protocol vs Scheme
 *
 * Despite its name, [java.net.URL.getProtocol] returns the [scheme][java.net.URI.getScheme] (http,
 * https, etc.) of the URL, not the protocol (http/1.1, spdy/3.1, etc.). OkHttp uses the word
 * *protocol* to identify how HTTP messages are framed.
 *
 * [ietf_alpn]: http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg
 */
enum class Protocol(private val protocol: String) {
  /**

10EB2..10EFC  ; disallowed                             # NA   <reserved-10EB2>..<reserved-10EFC>
10EFD..10EFF  ; valid                                  # 15.0 ARABIC SMALL LOW WORD SAKTA..ARABIC SMALL LOW WORD MADDA
10F00..10F1C  ; valid                                  # 11.0 OLD SOGDIAN LETTER ALEPH..OLD SOGDIAN LETTER FINAL TAW WITH VERTICAL TAIL