Another important use of URL redirection is to tell visitors who arrive at your website via plain old unencrypted HTTP that they should visit using HTTPS (secure HTTP) instead.

Source: https://nakedsecurity.sophos.com/2023/02/20/godaddy-admits-crooks-hit-us-with-malware-poisoned-customer-websites/

In addition, various categories of urgency were assigned, from “routine” and “priority” up to “flash,” under which messages were to be sent unencrypted to save time and to be used only in cases of “enemy contact.”

Source: https://www.postandcourier.com/opinion/commentary/commentary-sloppiness-isnt-the-only-problem-with-classified-documents/article_4bcfb5c8-b69d-11ed-a480-df6badd49852.html

You don’t want your passwords downloaded as plain text—even if you delete the file, it can be recoverable on an unencrypted drive.

Source: https://www.pcworld.com/article/1445758/how-to-export-your-passwords-and-ditch-lastpass.html