The response's envelope can hold special metadata about a message in its `Options` field. The slack adapter uses this when sending a response via HTTP: https://github.com/danryan/hal/blob/master/adapter/slack/slack.go#L274-320
The response's envelope can hold special metadata about a message in its
Optionsfield. The slack adapter uses this when sending a response via HTTP: https://github.com/danryan/hal/blob/master/adapter/slack/slack.go#L274-320