in reply to
The Environment variable for URL...
Or the exact names of some of the variables:
HTTP_HOST i.e. "some.where.com"
REQUEST_URI i.e. "/page/file.cgi"
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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