the `Accept-Encoding` header is not otherwise set. Web servers must be configured to return zstd
responses.

Note that zstd is not used for sending requests.

```java
OkHttpClient client = new OkHttpClient.Builder()
  .addInterceptor(ZstdInterceptor.INSTANCE)
  .build();
```

```kotlin
implementation("com.squareup.okhttp3:okhttp-zstd:0.0.0")
```

          if (contentLength != -1) {
            System.out.format("%d%% done\n", (100 * bytesRead) / contentLength);
          }
        }
      }
    };

    OkHttpClient client = new OkHttpClient.Builder()
        .addNetworkInterceptor(chain -> {
          Response originalResponse = chain.proceed(chain.request());
          return originalResponse.newBuilder()

import java.util.Arrays
import mockwebserver3.MockResponse
import mockwebserver3.MockWebServer
import mockwebserver3.junit5.StartStop
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

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() {

import javax.security.auth.callback.Callback
import javax.security.auth.callback.CallbackHandler
import javax.security.auth.callback.PasswordCallback
import javax.security.auth.callback.UnsupportedCallbackException
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.internal.SuppressSignatureCheck
import okhttp3.internal.platform.Platform

/**
 * Example of using a hardware key to perform client auth.

 */
package okhttp3.internal.http2

import java.io.IOException
import java.net.ProtocolException
import java.util.Locale
import java.util.concurrent.TimeUnit
import okhttp3.Headers
import okhttp3.OkHttpClient
import okhttp3.Protocol
import okhttp3.Request
import okhttp3.Response
import okhttp3.internal.headersContentLength
import okhttp3.internal.http.ExchangeCodec
import okhttp3.internal.http.ExchangeCodec.Carrier

 * limitations under the License.
 */
package okhttp3.recipes.kt

import java.io.IOException
import okhttp3.CertificatePinner
import okhttp3.OkHttpClient
import okhttp3.Request

class CertificatePinning {
  private val client =
    OkHttpClient
      .Builder()
      .certificatePinner(
        CertificatePinner
          .Builder()

  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()

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
      ))

Applications that want to use the global SSL context with OkHttp should configure their
OkHttpClient instances with the following:

```java
okHttpClient.setSslSocketFactory(HttpsURLConnection.getDefaultSSLSocketFactory());
```

A simpler solution is to avoid the shared default SSL socket factory. Instead, if you
need to customize SSL, do so for your specific OkHttpClient instance only.

##### Synthetic headers have changed