response.append(String.format("<h1>%s</h1>", basePath));
    for (String file : directory.list()) {
      response.append(String.format("<div class='file'><a href='%s'>%s</a></div>",
          basePath + file, file));
    }
    response.append("</body></html>");

    return new MockResponse()
        .setStatus("HTTP/1.1 200")

import okhttp3.HttpUrl;
import okhttp3.WebSocket;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.WebSocketListener;
import okio.ByteString;

/**
 * API access to the <a href="https://api.slack.com/apps">Slack API</a> as an application. One
 * instance of this class may operate without a user, or on behalf of many users. Use the Slack API
 * dashboard to create a client ID and secret for this application.

        return;
      }

      Document document = Jsoup.parse(response.body().string(), url.toString());
      for (Element element : document.select("a[href]")) {
        String href = element.attr("href");
        HttpUrl link = response.request().url().resolve(href);
        if (link == null) continue; // URL is either invalid or its scheme isn't http/https.
        queue.add(link.newBuilder().fragment(null).build());
      }