bin/appmgr/scheme_map.config

{
    "launchers": {
        "package": [ "file", "fuchsia-pkg" ],
        "fuchsia-pkg://fuchsia.com/web_runner#meta/web_runner.cmx": [ "http", "https" ],
        "fuchsia-pkg://fuchsia.com/cast_runner#meta/cast_runner.cmx": [ "cast", "casts" ]
    }
}