.build();
    return chain.proceed(compressedRequest);
  }

  private RequestBody gzip(final RequestBody body) {
    return new RequestBody() {
      @Override public MediaType contentType() {
        return body.contentType();
      }

      @Override public long contentLength() {
        return -1; // We don't know the compressed length in advance!
      }

import okhttp3.Cookie
import okhttp3.Credentials.basic
import okhttp3.EventListener
import okhttp3.Headers.Companion.headersOf
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.Interceptor
import okhttp3.MediaType
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.OkHttpClient
import okhttp3.OkHttpClientTestRule
import okhttp3.Protocol
import okhttp3.RecordingCookieJar
import okhttp3.RecordingHostnameVerifier

import mockwebserver3.junit5.StartStop
import okhttp3.Credentials.basic
import okhttp3.Headers.Companion.headersOf
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.TestUtil.assertSuppressed
import okhttp3.internal.RecordingAuthenticator
import okhttp3.internal.RecordingOkAuthenticator

import okhttp3.CallEvent.RetryDecision
import okhttp3.CertificatePinner.Companion.pin
import okhttp3.Credentials.basic
import okhttp3.Headers.Companion.headersOf
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.ResponseBody.Companion.asResponseBody
import okhttp3.TestUtil.assumeNotWindows
import okhttp3.TestUtil.awaitGarbageCollection

    val call =
      client.newCall(
        Request
          .Builder()
          .url(server.url("/"))
          .post(
            object : RequestBody() {
              override fun contentType(): MediaType? = null

              override fun writeTo(sink: BufferedSink) {
                try {
                  for (i in 0..9) {
                    sink.writeUtf8(".")
                    sink.flush()

    multipartReader.use {
      while (true) {
        val part = multipartReader.nextPart() ?: break
        process(part.headers, part.body)
      }
    }
    ```

 *  New: `MediaType.parameter()` gets a parameter like `boundary` from a media type like
    `multipart/mixed; boundary="abc"`.

 *  New: `Authenticator.JAVA_NET_AUTHENTICATOR` forwards authentication requests to

    Previously clones shared interceptors, which made it difficult to customize
    the interceptors on a request-by-request basis.

 *  New: `Headers.toMultimap()`.
 *  New: `RequestBody.create(MediaType, ByteString)`.
 *  New: `ConnectionSpec.isCompatible(SSLSocket)`.
 *  New: `Dispatcher.getQueuedCallCount()` and
    `Dispatcher.getRunningCallCount()`. These can be useful in diagnostics.

import mockwebserver3.RecordedRequest
import mockwebserver3.SocketEffect.ShutdownConnection
import mockwebserver3.junit5.StartStop
import okhttp3.Cache.Companion.key
import okhttp3.Headers.Companion.headersOf
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.internal.addHeaderLenient
import okhttp3.internal.cacheGet
import okhttp3.internal.platform.Platform.Companion.get