       buildpack: req.body.buildpack
       cache:     req.body.cache
       env:       req.body.env
+      keepalive: req.body.keepalive
     require("builder").init().build req.body.source, options, (build, builder) ->
       res.writeHead 200
         "Content-Type":      "text/plain"

        "X-Cache-Url":       builder.cache_url
        "X-Manifest-Id":     builder.id
        "X-Slug-Url":        builder.slug_url()
      build.on "data", (data)   ->
        exit_header = "ANVIL!EXITCODE:"
        if (pos = data.toString().indexOf(exit_header)) > -1

        else
          res.write(data)
      build.on "end", (success) ->
        clearInterval ping if ping
        logger.finish()
        res.end()

