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[edited by: not2easy at 10:24 pm (utc) on Feb 5, 2017]
[edit reason] Readability: Please use example.com [/edit]
http://www.example.com http:example.com and example.com all redirect to www.example.com
*whatever* is put before the sitename, it would still redirect to www.sitename.com
with parentheses and a question mark, together meaning "this part is optional". But in this day and age, I seriously doubt that any human browser--or any legitimate robot--doesn't send the “Host:” header.
*whatever** was before the website name, it would still end up as www.example.com
if http was at the beginning