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Editorial Team
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Asked: 2026-05-23T06:26:33+00:00

Possible Duplicate: How do short URLs services work? I often see shortened urls from

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Possible Duplicate:
How do short URLs services work?

I often see shortened urls from bitly.com such as http://bit.ly/abcd. How is this “bit.ly” realized at server side? Is it some DNS trick inside?

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  1. Editorial Team

    Yes.. actually if you go to https://bitly.com/ you will notice that it provides this URL shortening service.

    Going to http://bit.ly/abcd just redirects it to a URL of your choice. You can figure it by looking at the HTTP request and response headers

    Request URL:http://bit.ly/abcd
Request Method:GET
Status Code:301 Moved
Request Headersview source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Connection:keep-alive
Host:bit.ly
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.24 Safari/535.1
Response Headersview source
Cache-control:private; max-age=90
Connection:keep-alive
Content-Length:145
Content-Type:text/html; charset=utf-8
Date:Thu, 16 Jun 2011 21:14:04 GMT
Location:http://macthemes2.net/forum/viewtopic.php?id=16786044
MIME-Version:1.0
Server:nginx
Set-Cookie:_bit=4dfa721c-001f7-011f8-c8ac8fa8;domain=.bit.ly;expires=Tue Dec 13 16:14:04 2011;path=/; HttpOnly

    http://www.w3.org/Protocols/HTTP/HTRESP.html talks about status codes and 301 is what you should be looking for

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