URL shortening dates back at least to 2001, before Twitter
launch. TinyURL was launched in 2002, and was the first notable URL
shortener service. URL shorteners main service is to transform a
long URL to a smaller URL. Some of these services provide
statistics about the number of clicks on the shortened URL.
Redirect type web links can be redirected to the long URL
with several techniques. Using HTTP redirect with either code 301
for permanent redirection or code 302 for temporary redirection.
The 301 redirection is good for SEO to give credits to the link.
While 302 might be good if the service provide th ability to change
the long URL it points too.
Preview URL some services does not directly redirect you
to the long URL you gave; but instead ask you if you want to be
redirected and display the full URL. This is an important feature
to avoid being redirected to some unsecure website or to detect
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