server.enqueue(
      MockResponse.Builder()
        .addInformationalResponse(
          MockResponse(
            code = HTTP_EARLY_HINTS,
            headers = headersOf("Link", "</style.css>; rel=preload; as=style"),
          ),
        ).build(),
    )
    val request =
      Request(
        url = server.url("/"),
        body = "abc".toRequestBody("text/plain".toMediaType()),

      stream.getSink().buffer().use { sink ->
        sink.writeAll(source)
      }
    }
  }

  private fun contentType(file: File): String {
    return when {
      file.name.endsWith(".css") -> "text/css"
      file.name.endsWith(".gif") -> "image/gif"
      file.name.endsWith(".html") -> "text/html"
      file.name.endsWith(".jpeg") -> "image/jpeg"
      file.name.endsWith(".jpg") -> "image/jpeg"