Today I used a url shortener <a target='_blank' rel='noopener noreferrer' href="https://bitly.com/">bitly</a> in order to send a short link to my friend. However I asked a question: How does this mechanism functions?
Given a link like that: 
https://www.google.com/search?biw=1536&amp;bih=754&amp;tbm=isch&amp;sa=1&amp;ei=jiBvXOf0Ks2alwTAypnYBQ&amp;q=doff+percussion&amp;oq=doff+percussion&amp;gs_l=img.3...1141.4921..5288...0.0..0.316.1370.5j4j1j1......1....1..gws-wiz-img.......0j0i5i30j0i8i30.Z8X4g9KjBW4#imgdii=lINUWbaE372o4M:&amp;imgrc=EPOQSmfw82oVIM:
I think that the bitly service will generate a code for this link to be something like this: 
https://bit.ly/2GWhfPZ
So a new link with an ID &#39;2GWhfPZ&#39; corresponding to the given link will be stored in the database (if it will exists)
But when I put the generated link into a browser, how does the browser map the generated bitly link with the real one and returns the result?

Today I used a url shortener  [bitly](https://bitly.com/)  in order to send a short link to my friend. However I asked a question: How does this mechanism functions?
Given a link like that: 
https://www.google.com/search?biw=1536&bih=754&tbm=isch&sa=1&ei=jiBvXOf0Ks2alwTAypnYBQ&q=doff+percussion&oq=doff+percussion&gs_l=img.3...1141.4921..5288...0.0..0.316.1370.5j4j1j1......1....1..gws-wiz-img.......0j0i5i30j0i8i30.Z8X4g9KjBW4#imgdii=lINUWbaE372o4M:&imgrc=EPOQSmfw82oVIM:

I think that the bitly service will generate a code for this link to be something like this: 
https://bit.ly/2GWhfPZ

So a new link with an ID '2GWhfPZ' corresponding to the given link will be stored in the database (if it will exists)

But when I put the generated link into a browser, how does the browser map the generated bitly link with the real one and returns the result?

How the url-shortener works?

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