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Technical/Programming/Non-SEO Pros and Cons of WWW or no-WWW?

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问题 What are technical/programming/non-SEO pros and cons of www or no-www, for domains as well as sub-domains? From Jeff Atwood's twitter at http://twitter.com/codinghorror/status/1637428313 : "sort of regretting the no-www choice because it causes full cookie submission to ALL subdomains. :(" What does this mean? Is there a blog post or article detailing this? What other specific issues and their reasons should be considered for www. vs no-www. Update : On searching for more info on this topic,

Should I default my website to www.foo or not?

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Notice how the default domain for stackoverflow is http://stackoverflow.com and if you try to goto http://www.stackoverflow.com it bounces you to http://stackoverflow.com ? What is the reason for this? Not the tech reason (as in the http code, etc) but why would the site owners want to do this? I know it's purely aesthetic and I always have host-headers for both www and not, but is there a reason to bounce a user to a single domain, subheaded or not? Update 1 Not having a subdomain is called a bare domain . Thanks peeps! never knew it had a term :) Update 2 Thanks for the answers so far -

Should I default my website to www.foo or not?

阅读更多关于 Should I default my website to www.foo or not?

问题 Notice how the default domain for stackoverflow is http://stackoverflow.com and if you try to goto http://www.stackoverflow.com it bounces you to http://stackoverflow.com ? What is the reason for this? Not the tech reason (as in the http code, etc) but why would the site owners want to do this? I know it's purely aesthetic and I always have host-headers for both www and not, but is there a reason to bounce a user to a single domain, subheaded or not? Update 1 Not having a subdomain is called