docs: public synchronized void init() {
          httpClientFactoryEmbed = new AsyncHttpClientFactoryEmbed();
          map.put(HttpClientType.EMBED_FAST, httpClientFactoryEmbed.getFastClient());
          map.put(HttpClientType.EMBED_SLOW, httpClientFactoryEmbed.getSlowClient());
  
          // custom default are also the embed one; unless a change
          map.put(HttpClientType.CUSTOM_FAST, httpClientFactoryEmbed.getFastClient());
          map.put(HttpClientType.CUSTOM_SLOW, httpClientFactoryEmbed.getSlowClient());
  
          // make sure to use the default fast
          setHttpClientTypeCurrentDefault(HttpClientType.EMBED_FAST);
      }