Simple kittydar server

server.js

var kittydar = require('kittydar')
  , kittyUtil = reqiure('kittydar/utils') // I just guess it worked that way
  , restify = require('restify')
  , http = require('http')
  ;

var server = restify.createServer()
  ;

// Parse GET parameters "image=..."
server.use(restify.queryParser());

server.get('/kittydar', function(req, res) {
  if ( !req.query.image ) {
    res.status(400).end();
  }
  else {
    getImageCanvas(req.query.image, function(error, canvas) {
      if ( error ) {
        console.error('Cannot download image.', error);
      }
      else {
        var cats = kittydar.detectCats(canvas)
        
        res.send(cats);
      }
    });
  }
});

server.listen(8080, '127.0.0.1');

function getImageCanvas(url, cb) {
  var req = http.get(url, function(res) {
    var fileContents = '';
    
    // HTTP status error
    if ( res.statusCode != 200 ) {
      cb({ code: res.statusCode, message: res.statusMessage });
      
      return;
    }
    
    res.on('data', function(data) {
      fileContents+= data;
    });
    
    res.on('end', function() {
      var canvas = kittyUtil.dataToCanvas(fileContents);
      
      // Success
      cb(null, canvas);
    });
    
    // HTTP response stream error
    res.on('error', cb);
  });

  // HTTP request error  
  req.on('error', cb);
}