Why using const?

Hi Borg, Hi Senior ASP Programmers,

in the forum you are using "const" at different places.

1.) I know this is a "clean" programmning.
2.) Sometimes its written that constants have a better performance than variables
3.) if you would that a variable never will change: use constant

Problem:
I am using one test server and one live server with "the same" code.  So i have to change for example in functions_member_API.asp the

const strMemberAPILoginURL = "http://test.liveserver.com/login.asp"
to
const strMemberAPILoginURL = "http://www.liveserver.com/login.asp"

You writting in the comment above the code that i have to use the full URL "http://..." and not  "/login.asp".

But manually change everytime is not a good choice.

Const strMemberAPILoginURL = "http://" & Req.SV("HTTP_HOST") & "/login.asp"

is not working with Const. So i have to use a variable.

Ok - now the question :
Is there any other important reason for using a constant instead of a variable?

thx all for your feedback
Sebastian

again: faster reply than the fire departement allows ;O)

thx n have a great day