* `null` will be returned if the host cannot be ToASCII encoded or if the result contains
 * unsupported ASCII characters.
 */
internal fun String.toCanonicalHost(): String? {
  val host: String = this

  // If the input contains a :, it’s an IPv6 address.
  if (":" in host) {
    // If the input is encased in square braces "[...]", drop 'em.

    The upcoming Android Studio runs in a JVM but has classes from Android and that confused OkHttp!

 *  Fix: Include the header `Accept: text/event-stream` for SSE calls. This header is not added if
    the request already contains an `Accept` header.

 *  Fix: Don't crash with a `NullPointerException` if a server sends a close while we're sending a
    ping. OkHttp had a race condition bug.


## Version 4.6.0

_2020-04-28_

    return exchange?.hasFailure == true &&
      exchangeFinder!!.routePlanner.hasNext(exchange?.connection)
  }

  /**
   * Returns a string that describes this call. Doesn't include a full URL as that might contain
   * sensitive information.
   */
  private fun toLoggableString(): String {
    return (
      (if (isCanceled()) "canceled " else "") +
        (if (forWebSocket) "web socket" else "call") +

    }

    assertThat(verifier.verify("foo.com", session)).isFalse()
    assertThat(verifier.verify("a.foo.com", session)).isFalse()
    // these checks test alternative subjects. The test data contains an
    // alternative subject starting with a japanese kanji character. This is
    // not supported by Android because the underlying implementation from

  val end = indexOfLastNonAsciiWhitespace(start, endIndex)
  return substring(start, end)
}

/**
 * Returns the index of the first character in this string that contains a character in
 * [delimiters]. Returns endIndex if there is no such character.
 */
fun String.delimiterOffset(
  delimiters: String,
  startIndex: Int = 0,
  endIndex: Int = length,
): Int {

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.ws

import assertk.assertThat
import assertk.assertions.contains
import assertk.assertions.isEqualTo
import assertk.assertions.matches
import java.io.EOFException
import java.io.IOException
import java.net.ProtocolException
import java.util.Random

    expectedCipherSuites.add(CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256.javaName)
    expectedCipherSuites.add(CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA.javaName)
    if (listOf<String>(*socket.supportedCipherSuites).contains("TLS_FALLBACK_SCSV")) {
      expectedCipherSuites.add("TLS_FALLBACK_SCSV")
    }
    assertThat(socket.enabledCipherSuites)
      .containsExactly(*expectedCipherSuites.toTypedArray())
  }

  @Test

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import assertk.assertThat
import assertk.assertions.contains
import assertk.assertions.containsExactly
import assertk.assertions.isEqualTo
import assertk.assertions.isFalse
import assertk.assertions.isNotNull
import assertk.assertions.isNull

 * instance for non-daemon threads.
 *
 * The task runner is also responsible for releasing held threads when the library is unloaded.
 * This is for the benefit of container environments that implement code unloading.
 *
 * Most applications should share a process-wide [TaskRunner] and use queues for per-client work.
 */
class TaskRunner(
  val backend: Backend,

  private val listener = RecordingEventListener()
  private lateinit var client: OkHttpClient
  private lateinit var url: HttpUrl

  /**
   * This is mutable and order matters. By default, it contains [IPv4, IPv6]. Tests may manipulate
   * it to prefer IPv6.
   */
  private var dnsResults = listOf<InetAddress>()

  @BeforeEach
  internal fun setUp() {
    val inetAddresses = InetAddress.getAllByName("localhost")