Hello,
I know that some web sites offer a service to shorten
long url. It is very useful when your site is hosted
by your Internet provider for example, and that you
have a long url. Or when you want to send it in an
e-mail.
tinyurl.com does that for example.
The principle is that you enter your long url in their
form and it gives you a shorten url like
tinyurl.com/h4599
I was wondering how it works. I think it must use PHP.
I see two possibilities.
First is that the site creates an html page with a
redirect header, like <META HTTP-EQUIV="REFRESH"
CONTENT="0;URL=...
But then it would mean that the site needs to host
thousands of web pages for all its users.
The second choice is to create a simple database with
two fields. The first is the long url and the second
is the shorten. So, when someone try tinyurl.com/h4599
it sends it to the real site.
But is it possible for a web site to capture all the
possible urls that it has created then compare it to
its database?
Because it has not created a webpage "h4599.html" for
example, then the site should show a 404 page.
Thanks for your help.
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