Demonstration of Node's support for chunked encoding.

gistfile1.txt

http = require "http"
fs = require "fs"

app = (request,response) ->
  n = 0
  out = fs.createWriteStream "./test.png"
  request.pipe out
  request.on "data", (data) ->
    console.log "CHUNK #{++n}: #{data.length} bytes"
  request.on "end", ->
    response.statusCode = 200
    response.write "OK"
    response.end()

http.createServer(app).listen(1337,"127.0.0.1").on "listening", ->
  console.log "Listening on port 1337"

Node's HTTP implementation handles chunked encoded requests by default. The request is already a stream so your code doesn't need to change to handle stream based data. Here's a simple demonstration that writes the request data to a file. Try it from curl with or without transfer-encoding.

curl -H 'transfer-encoding: chunked' --data-binary @<your-large-PNG-file> http:/ocalhost:1337