code: public List<String> getSites() {
  		List<String> sites = new ArrayList<String>();
  		if (this.sessions == null) {
  			return sites;
  		}
  
  		synchronized (sessionLock) {
  			sites.addAll(this.sessions.keySet());
  		}
  
  		return sites;
  	}
docs: Gets all of the sites with http sessions.
  
  @return all of the sites with http sessions