How do i analyse audio from URL?

[kiRyyy]

    var fs = require('fs')  
              , AudioContext = require('web-audio-api').AudioContext  
              , context = new AudioContext  

          context.outStream = process.stdout  

    fs.readFile(__dirname + '/sounds/powerpad.wav', function(err, buffer) {  
        if (err) throw err  
        context.decodeAudioData(buffer, function(audioBuffer) {  
          var bufferNode = context.createBufferSource()  
          bufferNode.connect(context.destination)  
          bufferNode.buffer = audioBuffer  
          bufferNode.loop = true  
          bufferNode.start(0)  
        })  
      })  
    } 

This code only reads from local mp3 file and I want read it from URL like: [http://streaming.radionomy.com/kiRyyy?lang=en%2cen-US%3bq%3d0.9%2cpt%3bq%3d0.8%2cpt-PT%3bq%3d0.7]

Or for another words, I want an equivalence like the follow code on my server:

    audio = new Audio();  
    audio.src = "http://streaming.radionomy.com/kiRyyy?lang=en%2cen-US%3bq%3d0.9%2cpt%3bq%3d0.8%2cpt-PT%3bq%3d0.7";  
    context = new AudioContext();  
    analyser = context.createAnalyser();