I have been trying to get a watcher slack action to post a message to one of my workspace's channels. In the environment where the message must originate from there is a requirement to use a proxy server for egress to the the Slack provided webhook URL. While XPack does support the use of a proxy, either in the general settings or specified directly as fields in the watch itself, there does not seem to be a way to specify basic authentication via username and password to the proxy server, which is required in my environment. I attempted appending the username and password to the host, i.e username:password@host, but this simply returned a DNS lookup failure on the host name. Is their any way to authenticate with a proxy server when attempting to use actions associated with a watch?