)
    }
  }

  @Test fun testH2PriorKnowledgeOkHttpClientConstructionSuccess() {
    val okHttpClient =
      OkHttpClient.Builder()
        .protocols(listOf(Protocol.H2_PRIOR_KNOWLEDGE))
        .build()
    assertThat(okHttpClient.protocols.size).isEqualTo(1)
    assertThat(okHttpClient.protocols[0]).isEqualTo(Protocol.H2_PRIOR_KNOWLEDGE)
  }

  @Test fun nullDefaultProxySelector() {

    ```java
      private final OkHttpClient client = new OkHttpClient();

      public void run() throws Exception {
        Request request = new Request.Builder()
            .url("http://httpbin.org/delay/1") // This URL is served with a 1 second delay.
            .build();

        // Copy to customize OkHttp for this request.
        OkHttpClient client1 = client.newBuilder()

Backwards-Incompatible Changes
------------------------------

#### OkHttpClient final methods

`OkHttpClient` has 26 accessors like `interceptors()` and `writeTimeoutMillis()` that were non-final
in OkHttp 3.x and are final in 4.x. These were made non-final for use with mocking frameworks like
[Mockito][mockito]. We believe subtyping `OkHttpClient` is the wrong way to test with OkHttp. If

    message: String,
    stackTrace: Any?,
  ) {
    var logMessage = message
    if (stackTrace == null) {
      logMessage += " To see where this was allocated, set the OkHttpClient logger level to " +
        "FINE: Logger.getLogger(OkHttpClient.class.getName()).setLevel(Level.FINE);"
    }
    log(logMessage, WARN, stackTrace as Throwable?)
  }

  private fun expectedConnectionCipherSuites(client: OkHttpClient): Set<String> {
    return client.connectionSpecs.first().cipherSuites!!.map { it.javaName }.intersect(defaultEnabledCipherSuites.toSet())
  }

  private fun makeClient(
    connectionSpec: ConnectionSpec? = null,
    tlsVersion: TlsVersion? = null,
    cipherSuites: List<CipherSuite>? = null,
  ): OkHttpClient {
    return this.client.newBuilder()
      .apply {

 * exceptions.
 *
 * Use [newClient] as a factory for a OkHttpClient instances. These instances are specifically
 * configured for testing.
 */
class OkHttpClientTestRule : BeforeEachCallback, AfterEachCallback {
  private val clientEventsList = mutableListOf<String>()
  private var testClient: OkHttpClient? = null
  private var uncaughtException: Throwable? = null
  private lateinit var testName: String

By default, OkHttp will attempt a `MODERN_TLS` connection.  However by configuring the client connectionSpecs you can allow a fall back to `COMPATIBLE_TLS` connection if the modern configuration fails.

```java
OkHttpClient client = new OkHttpClient.Builder()
    .connectionSpecs(Arrays.asList(ConnectionSpec.MODERN_TLS, ConnectionSpec.COMPATIBLE_TLS))
    .build();
```

    } finally {
      cache.delete()
    }
  }

  private fun OkHttpClient.get(url: String) {
    val request = Request.Builder().url(url).build()
    val response = this.newCall(request).execute()

    response.use {
      assertEquals(200, response.code)
    }
  }

  fun buildCloudflareIp(bootstrapClient: OkHttpClient): DnsOverHttps {
    return DnsOverHttps.Builder().client(bootstrapClient)

import okhttp3.CacheControl
import okhttp3.Call
import okhttp3.Callback
import okhttp3.Dns
import okhttp3.HttpUrl
import okhttp3.MediaType
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.OkHttpClient
import okhttp3.Protocol
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.Response
import okhttp3.internal.platform.Platform

import mockwebserver3.MockResponse
import mockwebserver3.MockWebServer
import mockwebserver3.SocketPolicy.FailHandshake
import okhttp3.HttpUrl
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.OkHttpClient
import okhttp3.OkHttpClientTestRule
import okhttp3.Protocol
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.Response
import okhttp3.TestUtil.assumeNotWindows