This regression was introduced in OkHttp 4.3.0.
 *  Fix: Don't crash with an `IllegalArgumentException` when using custom trust managers on
    Android 10. Android uses reflection to look up a magic `checkServerTrusted()` method and we
    didn't have it.
 *  Fix: Explicitly specify the remote server name when making HTTPS connections on Android 5. In

  private fun readJournal() {
    fileSystem.read(journalFile) {
      val magic = readUtf8LineStrict()
      val version = readUtf8LineStrict()
      val appVersionString = readUtf8LineStrict()
      val valueCountString = readUtf8LineStrict()
      val blank = readUtf8LineStrict()

      if (MAGIC != magic ||
        VERSION_1 != version ||
        appVersion.toString() != appVersionString ||

 * Fix: Ignore null header values (for compatibility with HttpURLConnection).
 * Add URLStreamHandlerFactory support so that `URL.openConnection()` uses
   OkHttp.
 * Expose the transport ("http/1.1", "spdy/3", etc.) via magic request headers.
   Use `X-Android-Transports` to write the preferred transports and
   `X-Android-Selected-Transport` to read the negotiated transport.


## Version 1.0.2

_2013-05-11_

    webServer.enqueue(
      MockResponse.Builder()
        .code(101)
        .setHeader("Connection", "Upgrade")
        .setHeader("Upgrade", "websocket")
        .setHeader("Sec-WebSocket-Accept", "magic")
        .build(),
    )
    webServer.enqueue(
      MockResponse.Builder()
        .socketPolicy(SocketPolicy.DisconnectAtStart)
        .build(),
    )
    val webSocket = newWebSocket()

    // yet known to the library, but are supported by the platform.
    ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
      .cipherSuites("MAGIC-CIPHER")
      .tlsVersions("TLS9k")
      .build()
  }

  @Test
  fun tls_missingRequiredCipher() {
    platform.assumeNotConscrypt()
    platform.assumeNotBouncyCastle()
    val tlsSpec =

 * limitations under the License.
 */
package okhttp3.internal.ws

import okio.Buffer
import okio.ByteString.Companion.encodeUtf8

object WebSocketProtocol {
  /** Magic value which must be appended to the key in a response header. */
  internal const val ACCEPT_MAGIC = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"

  /*
  Each frame starts with two bytes of data.

   0 1 2 3 4 5 6 7    0 1 2 3 4 5 6 7
  +-+-+-+-+-------+  +-+-------------+

    assertThat(readJournalLines()).isEqualTo(
      listOf(DiskLruCache.MAGIC, DiskLruCache.VERSION_1, "100", "2", "") + expectedBodyLines,
    )
  }

  private fun createJournal(vararg bodyLines: String) {
    createJournalWithHeader(
      DiskLruCache.MAGIC,
      DiskLruCache.VERSION_1,
      "100",
      "2",
      "",
      *bodyLines,
    )
  }

        "Expected 'Upgrade' header value 'websocket' but was '$headerUpgrade'",
      )
    }

    val headerAccept = response.header("Sec-WebSocket-Accept")
    val acceptExpected = (key + WebSocketProtocol.ACCEPT_MAGIC).encodeUtf8().sha1().base64()
    if (acceptExpected != headerAccept) {
      throw ProtocolException(
        "Expected 'Sec-WebSocket-Accept' header value '$acceptExpected' but was '$headerAccept'",
      )
    }