Databases
StackOverflow2013
Postsdbo
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    <p>There are MANY reasons to use the www sub-domain!</p> <p>When writing a URL, it's easier to handwrite and type "www.stackoverflow.com", rather than "<a href="http://stackoverflow.com">http://stackoverflow.com</a>". Most text editors, email clients, word processors and WYSIWYG controls will automatically recognise both of the above and create hyperlinks. Typing just "stackoverflow.com" will not result in a hyperlink, after all it's just a domain name.. Who says there's a web service there? Who says the reference to that domain is a reference to its web service? </p> <p>What would you rather write/type/say.. "www." (4 chars) or "http://" (7 chars) ??</p> <p>"www." is an established shorthand way of unambiguously communicating the fact that the subject is a web address, not a URL for another network service.</p> <p>When verbally communicating a web address, it should be clear from the context that it's a web address so saying "www" is redundant. Servers should be configured to return HTTP 301 (Moved Permanently) responses forwarding all requests for @.stackoverflow.com (the root of the domain) to the www subdomain.</p> <p>In my experience, people who think WWW should be omitted tend to be people who don't understand the difference between the web and the internet and use the terms interchangeably, like they're synonymous. The web is just one of many network services.</p> <p>If you want to get rid of www, why not change the your HTTP server to use a different port as well, TCP port 80 is sooo yesterday.. Let's change that to port 1234, YAY now people have to say and type "<a href="http://stackoverflow.com:1234">http://stackoverflow.com:1234</a>" (eightch tee tee pee colon slash slash stack overflow dot com colon one two three four) but at least we don't have to say "www" eh?</p>
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    1. POWhen should one use a 'www' subdomain?
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    1. COI enjoyed reading your post :)
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    2. COYou can still use `www.example.com` (for "www." being shorter than "http://"), but then redirect to "example.com". You should listen to both, but what you're using as the canonical one does not really matter (apart from cookie/subdomain issues mentioned by jdangel)
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    3. COThose arguments are ridiculous. Saying `www.` doesn't guarentee that someone will actually access it via HTTP over port 80, you just assume they will. Likewise, if you say to someone "stackoverflow.com" they will access it the same way. HTTP is a W3C standard protocol, browsers will add the `http://` because they *need* a protocol and just assume HTTP if it's missing. `http://www.` is not shorter than `http://`. Cookies are the *only* valid reasion to use `www.`, and even then that's only if you're too cheap to get a CDN or a second domain.
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