how to redirect www subdomain to non-www when domain is redirected to www

Question

My primary domain is currently permanently redirected to www.mydomain.com (non-www to www redirection), with .htaccess as follows:

RewriteCond %{HTTP_HOST} ^mydomain.com$
RewriteRule ^/?$ "http\:\/\/www\.mydomain\.com\/" [R=301,L]

RewriteCond %{HTTP_REFERER} !^http://mydomain.com/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^http://mydomain.com$      [NC]
RewriteCond %{HTTP_REFERER} !^http://www.mydomain.com/.*$      [NC]
RewriteCond %{HTTP_REFERER} !^http://www.mydomain.com$      [NC]

I would like to know how all subdomains that I'll be creating, ex. blog.mydomain.com, will be redirected to non-www, ex. blog.mydomain.com, and not www.blog.mydomain.com. Every time I create a subdomain and enter the non-www URL to the browser, it prompts a redirect loop.

Hope you can help! Thanks! :)

Fanchan

Possible duplicate of htaccess add www if not subdomain, if subdomain remove www – Fixer

Answer 1

Keep this one rule for all the sub-domains:

# rule for forcing www on main domain
RewriteCond %{HTTP_HOST} ^mydomain\.com$ [NC]
RewriteRule ^ http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

# rule for removing www on sub domains
RewriteCond %{HTTP_HOST} ^www\.([^.]+\.mydomain\.com)$ [NC]
RewriteRule ^ http://%1%{REQUEST_URI} [R=301,L]

Nodose

Can we make http part dynamic so that if site changes to https then it should be automatic? – Vinegar

This is not working if anyone adds https:// before www.sub.domain.com – Cherin

It is definitely a working rule and it has nothing to do with https – Nodose

Suppose I have my subdomain xyz.abc.com and now if someone browse to www.xyz.abc.com then it perfectly redirects to xyz.abc.com but if anyone adds https:// infront of www.xyz.abc.com then it is not able to redirect to without www – Cherin

@MrinmoyMk: Can you post a new question for this and I will post an answer there. – Nodose

this works fine for main domain and it redirect mydomain.com to https://www. as I want but it doesn't redirect sub.mydomain.com to https://sub. – Pusey

@Cem: This answer is not for http -> https. This is for removal of www for subdomains and adding www for main domain. – Nodose

Answer 2

This one supports http + https in one line:

# Redirect www subdomain to non-www 
RewriteCond %{HTTP_HOST} ^www\.([^.]+\.yourdomain\.com)$ [NC]
RewriteRule ^ http%{ENV:protossl}://%1%{REQUEST_URI} [R=301,L]

Pastelist