.htaccess - Remove www but do not affect subdomain (htaccess) -

rewritecond %{http_host} !^mysite.com$ [nc] rewriterule ^(.*)$ http://mysite.com/$1 [l,r=301] 

this strips www url.

without rule subdomain works (blog.site.com). rule converts (site.com/blog) , shows 404 errors.

what need keep affecting subdomain(s)?

also, i'm curious if removing www. thing? i've heard doesn't matter long pick 1 , stick it. i'm using <link rel="canonical" ... /> re-enforce it.

with (blog\.)? @ begin blog. becomes optional , redirect if different blog.mysite.com , mysite.com.

rewritecond %{http_host} !^(blog\.)?mysite\.com$ [nc] rewriterule ^(.*)$ http://mysite.com/$1 [l,r=301] 

a different way same be:

rewritecond %{http_host} !^mysite\.com$ [nc] rewritecond %{http_host} !^blog\.mysite\.com$ [nc] rewriterule ^(.*)$ http://mysite.com/$1 [l,r=301] 

which means if hostname different mysite.com , blog.mysite.com redirect.

to avoid duplicity choose between www or non-www , redirect every thing that.

so if u use www redirect non-www www , vice versa.