Script for checking longUrl redirect

[gweiying]

We've discussed the possibility of go.gov.sg links that directs to domain A, where domain A redirects to domain B.

This can be potentially misused by agency users who leave the service but own domains like A (where they can set their custom redirects to B).

As @yong-jie has suggested, a solution can be to periodically run a script to check that long links do not return 301. Other things that we can check with such a script is whether links return 404, i.e. broken links.