pragmatic caching behaviour, following common real-world browser like Firefox/Chrome and 
server behaviour when ambiguous.

# Basic Usage

```kotlin
  private val client: OkHttpClient = OkHttpClient.Builder()
      .cache(Cache(
          directory = File(application.cacheDir, "http_cache"),
          // $0.05 worth of phone storage in 2020
          maxSize = 50L * 1024L * 1024L // 50 MiB
      ))

```kotlin
testImplementation("com.squareup.okhttp3:okhttp-dnsoverhttps:5.1.0")
```

### Usage

```
  val appCache = Cache(File("cacheDir", "okhttpcache"), 10 * 1024 * 1024)
  val bootstrapClient = OkHttpClient.Builder().cache(appCache).build()

  val dns = DnsOverHttps.Builder().client(bootstrapClient)
    .url("https://dns.google/dns-query".toHttpUrl())

public final class UploadProgress {
  private static final String IMGUR_CLIENT_ID = "9199fdef135c122";
  private static final MediaType MEDIA_TYPE_PNG = MediaType.get("image/png");

  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
    final ProgressListener progressListener = new ProgressListener() {

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

    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

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

import com.squareup.moshi.Moshi
import okhttp3.Call
import okhttp3.OkHttpClient
import okhttp3.survey.types.Client
import okhttp3.survey.types.SuiteId
import retrofit2.Retrofit
import retrofit2.converter.moshi.MoshiConverterFactory

class SslLabsClient(
  callFactory: Call.Factory,
) {

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 assertk.assertThat
import assertk.assertions.isEqualTo
import assertk.assertions.matches
import mockwebserver3.MockResponse
import mockwebserver3.MockWebServer
import mockwebserver3.junit5.StartStop
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.testing.PlatformRule
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.RegisterExtension

/**
 * OkHttp.
 *
 * https://square.github.io/okhttp/

  private final HttpUrl baseUrl = HttpUrl.get("https://slack.com/api/");
  private final OkHttpClient httpClient;
  private final Moshi moshi;

  public final String clientId;
  public final String clientSecret;
  public final int port;

  public SlackApi(String clientId, String clientSecret, int port) {
    this.httpClient = new OkHttpClient.Builder()
        .build();
    this.moshi = new Moshi.Builder()

    val part: MultipartBody.Part = multipartBody.part(0)
    val headers: Headers? = part.headers()
    val body: RequestBody = part.body()
  }

  @Test @Disabled
  fun okHttpClient() {
    val client = OkHttpClient()
    val dispatcher: Dispatcher = client.dispatcher()
    val proxy: Proxy? = client.proxy()
    val protocols: List<Protocol> = client.protocols()