Impact of dropping www from main URL on SEO

by jpatokal   Last Updated August 20, 2018 08:04 AM - source

A client's website is currently at, with redirected there automatically. I've suggested that they reverse the redirection to drop the "www", so I can set up a subdomain that can use shared session cookies (= login to stays logged in at However, they're concerned that the change will impact their search engine rankings. Any advice?

Answers 1

First of all, as you're mentioned the reason to change that are cookies - there's no need - see "sub-domain cookies, sent in a parent domain request" on Stackoverflow:

The leading dot in the domain value means and its sub-domains. Without the leading dot, the cookie is only valid for this specific domain.

Note that when setting a cookie, domain values without a leading dot will be prepended with a dot. Only when the domain parameter is not set the user agent assumes the current domain for that cookie.

SEO-wise: If you go with "www." or without is not important, as long as you 301-redirect from the one to the intended one and all webmaster tools know what your intended domain is. BUT: If you would change this in an existing project, keep in mind the already existing backlinks and if it's worth to redirect them and possibly lose some link juice.

February 14, 2013 13:42 PM

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