assertFailsWith<IOException> {
      client.newCall(request).execute()
    }.also { expected ->
      assertThat(expected).hasMessage("unexpected end of stream")
    }
  }

  /** Respond to a proxy authorization challenge.  */
  @Test
  fun proxyAuthenticateOnConnect() {
    server.useHttps(handshakeCertificates.sslSocketFactory())
    server.enqueue(
      MockResponse(
        code = 407,