How to quickly test ALL .htaccess modifications
Introduction:
This online utility is for anyone who has made changes to a .htaccess file and quickly wants to test all possible URL variations - without having to repeatedly clear the browser cache.
Instructions:
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Open https://Supiet2.tk
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Type in a domain name or copy/paste URLs into the Domain name text area.
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Check ar least one of the required Protocol checkboxes.
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Start the test by selecting either the Simple or Verbose buttons.
Please note: Protocol and Schema are interchangeable
Output:
Response_code Message
200..299 Hunky Dory
300..399 Redirected to another URL
400..499 Whoops web-page problem
500..599 Disaster - site problem
Response Codes Summary:
Courtesy of Wiki: HTTP Status Codes
This App’ can also be used for testing:
* any web file
* any domain name
* recently modified .htaccess files
* other large organisation's redirections
* response times, cache control, content-type, etc
TL;DR
In the good old days there were only two URL variants:
1. http://
2. http://www
OH how the times have changed…
...the Internet became far more technical and remarkably complicated. Online banking, web payments and other internet monetary transactions became available which were easily breached. It was necessary to introduce new online theft prevention and the two more security URL variants were introduced...
1. https://
2. https://www
Background Stuff:
When a URL is called from a browser a vast amount of validation script is involved
Further details can be found at Wiki.com, search for http access codes which will keep you busy for a couple of months!
The depth of detail to ensure absolutely every possible scenario is covered is phenomenal.
Internet users have no idea the amount of work which has gone into this project.
The Team have not forgotten their humorous side:
It certainly raised a chuckle 
Problems have arisen…
Two HTTP Protocols were easily manageable. Now if an old HTTP URL Protocol is rendered nearly all web browsers show horrible warning messages even though the site maybe a blog and just renders information!
To eliminate the browser warnings a .htaccess file can be used to redirect all the old HTTP Protocols to the new secure HTTPS big brother schemes.
The tedious process to eliminate warnings and errors
Every change to the .htaccess file requires:
1. modify and upload .htaccess file
2. clear the browse cache
3. test http://domain-name.tld
4. test https://domain-name.tld
5. test http://www.domain-name.tld
6. test https://www.domain-name.tld
Repeat all six steps… until the desired result is achieved 
…but now there is an App’ for the last five steps
Using this Online Utility eliminates step #2 completely!
Also, instead of repeating the last four steps it is possible to send the HTTP Requests from the Online Server and request the URL Header information. Combine the request with Curl and the time taken for the four steps is usually less than a second!
5xx HTTP Response codes slow the fetching process until the allotted time-out is reached. This means that even if all four Protocols fail the maximum elapsed time is five seconds because Curl is programmed to run each request simultaneously.
The Curl alloted time is set to about 5 seconds.
I have learnt a lot writing this utility and welcome suggestions or enquiries.