# File lib/streamer-http.rb, line 93
    def do_POST(req, res)
      docstring = req.body
      enveloped = add_envelope(
        ["append"],
        Outcry.create_document(docstring).find("//tracks/track/parent::*").first)
      write_message(enveloped.to_s)
      res.status = 200
    end