fun get(protocol: String): Protocol {
      // Unroll the loop over values() to save an allocation.
      @Suppress("DEPRECATION")
      return when (protocol) {
        HTTP_1_0.protocol -> {
          HTTP_1_0
        }

        HTTP_1_1.protocol -> {
          HTTP_1_1
        }

        H2_PRIOR_KNOWLEDGE.protocol -> {
          H2_PRIOR_KNOWLEDGE
        }

        protocol =
          when (httpMinorVersion) {
            0 -> Protocol.HTTP_1_0
            1 -> Protocol.HTTP_1_1
            else -> throw ProtocolException("Unexpected status line: $statusLine")
          }
      } else if (statusLine.startsWith("ICY ")) {
        // Shoutcast uses ICY instead of "HTTP/1.0".
        protocol = Protocol.HTTP_1_0
        codeStart = 4
      } else if (statusLine.startsWith("SOURCETABLE ")) {

import org.junit.jupiter.api.Assertions.assertThrows
import org.junit.jupiter.api.Test

class ProtocolTest {
  @Test
  fun testGetKnown() {
    assertThat(get("http/1.0")).isEqualTo(Protocol.HTTP_1_0)
    assertThat(get("http/1.1")).isEqualTo(Protocol.HTTP_1_1)
    assertThat(get("spdy/3.1")).isEqualTo(Protocol.SPDY_3)
    assertThat(get("h2")).isEqualTo(Protocol.HTTP_2)

  // https://github.com/square/okhttp/issues/386
  @Test
  fun shoutcast() {
    val statusLine = parse("ICY 200 OK")
    assertThat(statusLine.message).isEqualTo("OK")
    assertThat(statusLine.protocol).isEqualTo(Protocol.HTTP_1_0)
    assertThat(statusLine.code).isEqualTo(200)
  }

  @Test
  fun missingProtocol() {
    assertInvalid("")
    assertInvalid(" ")
    assertInvalid("200 OK")
    assertInvalid(" 200 OK")
  }

  /**
   * Returns the protocol negotiated by this connection, or [Protocol.HTTP_1_1] if no protocol
   * has been negotiated. This method returns [Protocol.HTTP_1_1] even if the remote peer is using
   * [Protocol.HTTP_1_0].
   */
  fun protocol(): Protocol

      this.platform = platform
      PublicSuffixDatabase.resetForTests()
    }

    fun alpnProtocolNames(protocols: List<Protocol>) = protocols.filter { it != Protocol.HTTP_1_0 }.map { it.toString() }

    val isAndroid: Boolean
      get() = PlatformRegistry.isAndroid

    /** Attempt to match the host runtime to a capable Platform implementation. */