docs: function handler(req,res){  
      try{
        res.writeHead(200, {'Content-Type': 'text/html'});
        var start = new Date().getTime();
        //console.log(start);
  
        //read css, wait.for syntax:
        var css = wait.for(fs.readFile,'style.css','utf8');
  
        //read post, fancy syntax:
        var content = wait.for(fs.readFile,'blogPost.txt','utf8');
  
        //compose  template, fancy syntax, as parameter:
        var template = composeTemplate ( css, wait.for(fs.readFile,'blogTemplate.html','utf8') );
  
        console.log('about to call hardToGetData...');
  
        //call async, wait.for syntax, in a expression
        var hardToGetData = "\n" + start.toString().substr(-5) +"<br>" + ( wait.for(longAsyncFn,'some data') );
  
        console.log('hardToGetData=',hardToGetData);
        
        var end = new Date().getTime();
  
        hardToGetData += ', after '+(end-start)+' ms<br>';
        hardToGetData += end.toString().substr(-5);
  
        res.end( applyTemplate(template, formatPost ( content + hardToGetData) ) );
  
      }
      catch(err){
        res.end('ERROR: '+err.message);
      }
    }