Re: Access-Control-Allow-Origin header in CLI server

This is not the sort of thing that belongs in an HTTP server by default. It's a one-off header that some users may elect to send but the vast majority will not. If you need to simulate the feature of an third-party server mod/plugin you should manually make a header('Access-Control-Allow-Origin: ...') as needed in your development code. From an HTTP standpoint, baking this directly into the CLI server doesn't make much sense IMO.