Safari removes HTTP from address bar

I am just answering to a question that has been closed without getting any answer.

The original post by Douglas Mcdonald (Safari removes 'http' from address bar an… - Apple Community):

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Safari removes 'http' from address bar and redirects '.test' TLDs to google search

When developing client sites I often create a local domain "clientdomain.test", as this has been the most reliable TLD that doesn't otherwise attempt to redirect to a search engine (google in this case). This works fine when qualifying the full domain name with 'http://'. However, Safari constantly removes the 'http://' after loading the page (presumable to save space in the address bar). The problem however is that if I manually change the URI (i.e. "clientdomain.test/test-page") to quickly navigate to that page, Safari redirects the string to google search. Which means I have to hit the back button, and manually add 'http://' to the beginning of the url again, and refresh. So frustrating, and a huge time-waist. Is there any way to either stop safari from removing the 'http://' from URLs, or to tell safari to stop automatically redirecting strings that end in the '.test' TLD. It is a valid TLD!

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The solution is to disable the "Not secure connection warning" in Safari's Settings -> Security

For some reason safari doesn't warn if this option is enabled but instead it's blocking the "http://" string which causes many problems.