assertThat(cache.hitCount()).isEqualTo(0)
  }

  private fun String.toOneShotRequestBody(): RequestBody =
    object : RequestBody() {
      val internalBody = Stream.of(this)

      override fun isOneShot(): Boolean = true

      override fun contentType(): MediaType? = "application/text-plain".toMediaTypeOrNull()

      override fun writeTo(sink: BufferedSink) {
        internalBody.forEach { item ->

            override fun contentType(): MediaType? = null

            override fun writeTo(sink: BufferedSink) {
              sink.writeUtf8("attempt " + attempt++)
            }

            override fun isOneShot(): Boolean = true
          },
      )
    val response = client.newCall(request).execute()
    assertThat(response.code).isEqualTo(503)
    assertThat(response.body.string()).isEqualTo("please retry")

 *  New: `OkHttpClient.webSocketCloseTimeout` configures how long a web socket connection will wait
    for a graceful shutdown before it performs an abrupt shutdown.

 *  Fix: Honor `RequestBody.isOneShot()` in `MultipartBody`

 *  Fix in `okhttp-coroutines`: Don't leak response bodies in `executeAsync()`. We had a bug where
    we didn't call `Response.close()` if the coroutine was canceled before its response was

    most common use of duplex calls is [gRPC][grpc_http2].

 *  New: Prevent OkHttp from retransmitting a request body by overriding `RequestBody.isOneShot()`.
    This is most useful when writing the request body is destructive.

 *  New: We've added `requestFailed()` and `responseFailed()` methods to `EventListener`. These