OkHttp 2 the built-in disk cache is the only supported response cache.

 *  **HttpResponseCache has been renamed to Cache.** Install it with
    `OkHttpClient.setCache(...)` instead of `OkHttpClient.setResponseCache(...)`.

 *  **OkAuthenticator has been replaced with Authenticator.** This new
    authenticator has access to the full incoming response and can respond with

 */
package okhttp3.dnsoverhttps

import java.io.File
import java.net.UnknownHostException
import java.security.Security
import okhttp3.Cache
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.OkHttpClient
import okhttp3.dnsoverhttps.DohProviders.providers
import org.conscrypt.OpenSSLProvider

private fun runBatch(
  dnsProviders: List<DnsOverHttps>,
  names: List<String>,
) {

import java.util.concurrent.TimeUnit
import kotlin.test.assertFailsWith
import okhttp3.Call
import okhttp3.Callback
import okhttp3.DelegatingServerSocketFactory
import okhttp3.DelegatingSocketFactory
import okhttp3.OkHttpClient
import okhttp3.OkHttpClientTestRule
import okhttp3.Request
import okhttp3.RequestBody
import okhttp3.Response
import okhttp3.mockwebserver.MockResponse
import okhttp3.mockwebserver.MockWebServer

* Cache is not an interface with alternative implementations.

Get a URL
---------

This program downloads a URL and prints its contents as a string. [Full source][get_example].

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

String run(String url) throws IOException {
  Request request = new Request.Builder()
      .url(url)
      .build();

  try (Response response = client.newCall(request).execute()) {

first. Fast fallback gives IPv6 connections a 250 ms head start so IPv6 is preferred on networks
where it's available.

To opt-in, configure your `OkHttpClient.Builder`:


```
OkHttpClient client = new OkHttpClient.Builder()
    .fastFallback(true)
    .build();
```

 *  New: Change the build from Kotlin-JVM to Kotlin-multiplatform (which includes JVM). Both

import okhttp3.Dns
import okhttp3.OkHttpClient
import okhttp3.Protocol
import okhttp3.Request
import org.junit.jupiter.api.Assumptions.assumeTrue
import org.junit.jupiter.api.Tag
import org.junit.jupiter.api.Test

/**
 * Tests for SNI overriding on Android.
 */
@Tag("Remote")
class SniOverrideTest {
  var client =
    OkHttpClient
      .Builder()
      .build()

  @Test

import okhttp3.Cache
import okhttp3.OkHttpClient
import okhttp3.survey.ssllabs.SslLabsClient
import okhttp3.survey.types.Client
import okhttp3.survey.types.SuiteId
import okio.FileSystem
import okio.Path.Companion.toPath
import org.conscrypt.Conscrypt

@Suppress("ktlint:standard:property-naming")
suspend fun main() {
  val includeConscrypt = false

  val client =
    OkHttpClient
      .Builder()

import kotlin.time.Duration
import okhttp3.Dispatcher
import okhttp3.EventListener
import okhttp3.Headers
import okhttp3.HttpUrl
import okhttp3.HttpUrl.Companion.defaultPort
import okhttp3.OkHttpClient
import okhttp3.Response
import okhttp3.internal.http2.Header
import okio.Buffer
import okio.BufferedSource
import okio.Source

/** GMT and UTC are equivalent for our purposes. */
@JvmField

import okhttp3.ConnectionPool
import okhttp3.ConnectionSpec
import okhttp3.Cookie
import okhttp3.Headers
import okhttp3.HttpUrl
import okhttp3.MediaType
import okhttp3.MediaType.Companion.toMediaTypeOrNull
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.Response
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.connection.ConnectionListener
import okhttp3.internal.connection.RealConnection

In OkHttp some fields of the address come from the URL (scheme, hostname, port) and the rest come from the [OkHttpClient](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-ok-http-client/).

### [Routes](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-route/)