Node.js base64 encode a downloaded image for use in data URI

expressjs-base64-image.js

express = require("express")
request = require("request")
BufferList = require("bufferlist").BufferList
app = express.createServer(express.logger(), express.bodyParser())
app.get "/", (req, res) ->
  if req.param("url")
    url = unescape(req.param("url"))
    request
      uri: url
      encoding: 'binary'
    , (error, response, body) ->
      if not error and response.statusCode is 200
        data_uri_prefix = "data:" + response.headers["content-type"] + ";base64,"
        image = new Buffer(body.toString(), "binary").toString("base64")
        image = data_uri_prefix + image
        res.send "<img src=\"" + image + "\"/>"

app.listen 3000