CodeIgniter app doesn't work when domain has "www" [closed]

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What things in CI or my server do I need to set so that my application will work with the "www" domain prefi开发者_开发知识库x. Everything works as intended -- as long as there is no "www". With the "www", I get all sort of errors (e.g. DB connection, etc.).

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you can check your config.php or .htaccess file(s) if you have them.