docs: function checkHost(host,callback) {
  
  	if(hostCache.get(host,callback)) {
  		console.log('checkHost: Resolved %s from hostCache...',host);
  		return true;
  	}
  
  	console.log('checkHost: Looking up %s...',host);
  
  	var options = {
  		host: host,
  		port: 80,
  		path: '/',
  		method: 'GET'
  	};
  
  	var req = http.request(options, function(res) {
  		var data = '';
  		res.setEncoding('utf8');
  
  		res.on('data', function (chunk) {
  			data += chunk;
  		});
  		res.on('end', function () {
  			hostCache.set(host,true);
  		});
  		res.on('error',function() {
  			hostCache.set(host,false);
  		});
  	});
  	req.on('error',function() {
  		hostCache.set(host,false);
  	});
  	req.end();
  }