return -1; // We don't know the compressed length in advance!
      }

      @Override public void writeTo(BufferedSink sink) throws IOException {
        BufferedSink gzipSink = Okio.buffer(new GzipSink(sink));
        body.writeTo(gzipSink);
        gzipSink.close();
      }
    };
  }
}
```

### Rewriting Responses

Here we `POST` a request body as a stream. The content of this request body is being generated as it's being written. This example streams directly into the [Okio](https://github.com/square/okio) buffered sink. Your programs may prefer an `OutputStream`, which you can get from `BufferedSink.outputStream()`.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

 * limitations under the License.
 */
@file:Suppress("ktlint:standard:filename")

package okhttp3.internal

import okhttp3.internal.idn.IDNA_MAPPING_TABLE
import okhttp3.internal.idn.Punycode
import okio.Buffer

/**
 * Quick and dirty pattern to differentiate IP addresses from hostnames. This is an approximation
 * of Android's private InetAddress#isNumeric API.
 *

import okhttp3.internal.http2.Http2Stream
import okhttp3.internal.http2.Settings
import okhttp3.internal.http2.StreamResetException
import okhttp3.internal.isHealthy
import okhttp3.internal.tls.OkHostnameVerifier
import okio.Buffer

/**
 * A connection to a remote web server capable of carrying 1 or more concurrent streams.
 *
 * Connections are shared in a connection pool. Accesses to the connection's state must be guarded

import okhttp3.internal.concurrent.wait
import okhttp3.internal.concurrent.withLock
import okhttp3.internal.connection.asBufferedSocket
import okio.AsyncTimeout
import okio.Buffer
import okio.BufferedSource
import okio.Source
import okio.buffer
import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.Assertions.assertArrayEquals
import org.junit.jupiter.api.Tag
import org.junit.jupiter.api.Test

import okhttp3.Headers
import okhttp3.Headers.Companion.headersOf
import okhttp3.WebSocketListener
import okhttp3.internal.addHeaderLenient
import okhttp3.internal.http2.ErrorCode
import okhttp3.internal.http2.Settings
import okio.Buffer

/** A scripted response to be replayed by the mock web server. */
public class MockResponse {
  /** Returns the HTTP response line, such as "HTTP/1.1 200 OK". */
  public val status: String

import okhttp3.internal.Tags
import okhttp3.internal.http.GzipRequestBody
import okhttp3.internal.http.HttpMethod
import okhttp3.internal.isProbablyUtf8
import okhttp3.internal.isSensitiveHeader
import okio.Buffer

/**
 * An HTTP request. Instances of this class are immutable if their [body] is null or itself
 * immutable.
 */
class Request internal constructor(
  builder: Builder,
) {
  @get:JvmName("url")

import java.math.BigInteger
import java.net.ProtocolException
import java.text.ParseException
import java.text.SimpleDateFormat
import java.util.Date
import java.util.TimeZone
import kotlin.reflect.KClass
import okio.ByteString

/**
 * Built-in adapters for reading standard ASN.1 types.
 */
internal object Adapters {
  val BOOLEAN =
    BasicDerAdapter(
      name = "BOOLEAN",
      tagClass = DerHeader.TAG_CLASS_UNIVERSAL,

import okhttp3.internal.connection.RealConnectionPool.Companion.get
import okhttp3.logging.HttpLoggingInterceptor
import okhttp3.testing.Flaky
import okhttp3.testing.PlatformRule
import okio.Buffer
import okio.BufferedSink
import org.hamcrest.BaseMatcher
import org.hamcrest.CoreMatchers
import org.hamcrest.Description
import org.hamcrest.Matcher
import org.hamcrest.MatcherAssert
import org.junit.Assume.assumeThat

import okhttp3.internal.platform.Platform.Companion.get
import okhttp3.java.net.cookiejar.JavaNetCookieJar
import okhttp3.testing.Flaky
import okhttp3.testing.PlatformRule
import okio.Buffer
import okio.BufferedSink
import okio.GzipSink
import okio.buffer
import okio.utf8Size
import org.bouncycastle.tls.TlsFatalAlert
import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Disabled