line:// is deprecated because it allows a takeover attack of the LINE URL scheme. Use
line:// takeover attack is an attack in which a user clicks on a URL following
line://, a non-LINE app may start regardless of the intention of the LINE user. This attack is only established under certain conditions.
line:// may be discontinued in the future. If this is decided, an announcement will be made here.
For more information on LINE URL scheme, see "Using LINE features with the LINE URL scheme".