// that happens, then we will have buffered bytes that are needed by the SSLSocket!
        // This check is imperfect: it doesn't tell us whether a handshake will succeed, just
        // that it will almost certainly fail because the proxy has sent unexpected data.
        if (source?.buffer?.exhausted() == false || sink?.buffer?.exhausted() == false) {

    try {
      server.url("/a").toUrl().openConnection().getInputStream()
      fail<Any>()
    } catch (expected: IOException) {
    }
    server.url("/b").toUrl().openConnection().getInputStream() // Should succeed.
  }

  /**
   * Throttle the request body by sleeping 500ms after every 3 bytes. With a 6-byte request, this
   * should yield one sleep for a total delay of 500ms.
   */
  @Test
  fun throttleRequest() {

    serverIpv4.enqueue(
      MockResponse(body = "this was the 2nd request on IPv4"),
    )
    serverIpv6.enqueue(
      MockResponse(body = "unexpected call to IPv6"),
    )

    // Confirm the retry succeeds on the same connection.
    val call = client.newCall(Request(url))
    val response = call.execute()
    assertThat(response.body.string()).isEqualTo("this was the 2nd request on IPv4")

 * typically false on Windows.
 *
 * If this returns false we won't permit simultaneous reads and writes. When writes commit we need
 * to delete the previous snapshots, and that won't succeed if the file is open. (We do permit
 * multiple simultaneous reads.)
 *
 * @param file a file in the directory to check. This file shouldn't already exist!
 */
internal fun FileSystem.isCivilized(file: Path): Boolean {

            .readTimeout(500, TimeUnit.MILLISECONDS)
            .build()
        try {
          client1.newCall(request).execute().use { response ->
            println("Response 1 succeeded: $response")
          }
        } catch (e: IOException) {
          println("Response 1 failed: $e")
        }

        // Copy to customize OkHttp for this request.
        val client2 = client.newBuilder()

    assertThat(response1.body.string()).isEqualTo("abc")
    response1.close()

    // Force a fresh connection for the next request.
    client.connectionPool.evictAll()

    // Confirm that a second request also succeeds. This should detect caching problems.
    server.enqueue(
      MockResponse.Builder()
        .body("def")
        .socketPolicy(DisconnectAtEnd)
        .build(),
    )
    val call2 =

      server.url("/a").toUrl().openConnection().getInputStream()
      fail<Unit>()
    } catch (expected: IOException) {
      // Expected.
    }
    server.url("/b").toUrl().openConnection().getInputStream() // Should succeed.
  }

  @Test
  fun clearDispatcherQueue() {
    server.enqueue(MockResponse(body = "A"))
    (server.dispatcher as QueueDispatcher).clear()
    server.enqueue(MockResponse(body = "B"))