ws://foo:80/  s:ws h:foo p:/
ws://foo:81/  s:ws h:foo port:81 p:/
ws://foo:443/  s:ws h:foo port:443 p:/
ws://foo:815/  s:ws h:foo port:815 p:/
wss://foo:80/  s:wss h:foo port:80 p:/
wss://foo:81/  s:wss h:foo port:81 p:/
wss://foo:443/  s:wss h:foo p:/
wss://foo:815/  s:wss h:foo port:815 p:/
http:/example.com/  s:http h:example.com p:/
ftp:/example.com/  s:ftp h:example.com p:/

  static final class SlackJsonAdapters {
    @ToJson String urlToJson(HttpUrl httpUrl) {
      return httpUrl.toString();
    }

    @FromJson HttpUrl urlFromJson(String urlString) {
      if (urlString.startsWith("wss:")) urlString = "https:" + urlString.substring(4);
      if (urlString.startsWith("ws:")) urlString = "http:" + urlString.substring(3);
      return HttpUrl.get(urlString);
    }
  }

    // Silently replace web socket URLs with HTTP URLs.
    private fun canonicalUrl(url: String) =
      when {
        url.startsWith("ws:", ignoreCase = true) -> "http:${url.substring(3)}"
        url.startsWith("wss:", ignoreCase = true) -> "https:${url.substring(4)}"
        else -> url
      }

    /**
     * Sets the URL target of this request.
     *

        .sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),
          handshakeCertificates.trustManager,
        ).hostnameVerifier(RecordingHostnameVerifier())
        .build()
    websocketScheme("wss")
  }

  @Test
  fun httpsScheme() {
    webServer.useHttps(handshakeCertificates.sslSocketFactory())
    client =
      client
        .newBuilder()
        .sslSocketFactory(