What is Url shortener
URL shortening is a technique on the World Wide Web in which a Uniform Resource Locator (URL) may be made substantially shorter and still direct to the required page. This is achieved by using a redirect which links to the web page that has a long URL.
history of url shortening :
...a system, method and computer program product for providing links to remotely located information in a network of remotely connected computers. A uniform resource locator (URL) is registered with a server. A shorthand link is associated with the registered URL. The associated shorthand link and URL are logged in a registry database. When a request is received for a shorthand link, the registry database is searched for an associated URL. If the shorthand link is found to be associated with a URL, the URL is fetched, otherwise an error message is returned.
The patent was filed in September 2000; while the patent was issued in 2005, US patent applications are made public within 18 months of filing.
Another reference to URL shortening was in 2001. The first notable URL shortening service, TinyURL, was launched in 2002. Its popularity influenced the creation of at least 100 similar websites, although most are simply domain alternatives. Initially Twitter automatically translated URLs longer than twenty-six characters using TinyURL, although it began using bit.ly instead in 2009 and later developed its own URL shortening service, t.co.
On 14 August 2009 WordPress announced the wp.me URL shortener for use when referring to any WordPress.com blog post. In November 2009, shortened links on bit.ly were accessed 2.1 billion times. Around that time, bit.ly and TinyURL were the most widely used URL-shortening services.
One service, tr.im, stopped generating short URLs in 2009, blaming a lack of revenue-generating mechanisms to cover costs and Twitter's default use of the bit.ly shortener, and questioning whether other shortening services could be profitable from URL shortening in the longer term. It resumed for a time, then closed.
The shortest possible long-term URLs were generated by NanoURL from December 2009 until about 2011, associated with the top-level .to (Tonga) domain, in the form http://to./xxxx, where xxxx represents a sequence of random numbers and letters.
On 14 December 2009 Google announced a service called Google URL Shortener at goo.gl, which originally was only available for use through Google products (such as Google Toolbar and FeedBurner) and extensions for Google Chrome. On 21 December 2009, Google introduced a YouTube URL Shortener, youtu.be. From September 2010 Google URL Shortener became available via a direct interface. The goo.gl service provides analytics details and a QR code generator. On 30 March 2018 Google announced that it is "turning down support for goo.gl over the coming weeks and replacing it with Firebase Dynamic Links" (although existing goo.gl links will continue to function).