support streams

[mcollina]

We should be able to call reply(null, stream).

[marcbachmann]

Oh, nice. I just landed on this issue by accident. I also need something like that in my setup.
I guess fastify responds with Content-Type: application/json by default, right?
So would you only support utf8 encoded streams and the stream is responsible to support proper json?

Or would you allow a custom content type by passing it somewhere?
And then we can also support line delimited json.

e.g.

fastify.get('/documents', function (opts, reply) {
  // returns a stream in object mode
  var stream = database.select('*').from('documents').toStream()

  // Set content type on stream
  stream['Content-Type'] = 'application/x-ndjson'
  reply(null, stream)
  // or
  reply(null, stream, {'Content-Type': 'application/x-ndjson'})
})

[mcollina]

I think we should do something with reply, rather than setting properties on the stream object.

[delvedor]

I'm working on stream support at the moment, in the next days will land a pr :)
https://github.com/mcollina/fastify/tree/stream-support

[delvedor]

Stream support added in #27.