       res.writeHead 200
         "Content-Type":      "text/plain"
         "Transfer-Encoding": "chunked"
+        "Request-Id":        builder.request_id
         "X-Cache-Url":       builder.cache_url
         "X-Manifest-Id":     builder.id
         "X-Slug-Url":        builder.slug_url(req.body.type)

          NODE_ENV:      process.env.NODE_ENV
          NODE_PATH:     process.env.NODE_PATH
          PATH:          process.env.PATH
          SLUG_ID:       @id
          SLUG_URL:      @slug_url(options.type)
          SLUG_PUT_URL:  slug_put_url

class Builder

  constructor: () ->
    @id         = uuid.v4()
    @request_id = @id
    @spawner    = require("spawner").init()
    @storage    = require("storage").init()

  build: (source, options, cb) ->
    ext = if options.type is "deb" then "deb" else "tgz"
