如何通过mod_rewrite重定向删除'www'？ [关闭]

Question

I want to redirect https://www.example.com to https://example.com. I followed this answer but it doesn't work. By the way, ErrorDocument 404 doesn't work as well.

What do have I have to do? Here is my file:

<IfModule mod_rewrite.c>
RewriteEngine on  
RewriteBase /

RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} !^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} !^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L]
AddType application/x-httpd-php html 

ErrorDocument 404 https://kocer.org/index.php?p=notfound
</IfModule>

Answer 1

You can use this:

<IfModule mod_rewrite.c>
    RewriteEngine on  
    RewriteBase /

    RewriteCond %{HTTP_HOST}#%{HTTPS}s ^www\.([^#]+)#(?:off|on(s)) [NC]
    RewriteRule ^ http%2://%1%{REQUEST_URI} [NE,L,R=301]
</IfModule>
AddType application/x-httpd-php html 
ErrorDocument 404 /index.php?p=notfound

ErrorDocument Directive
Note that when you specify an ErrorDocument that points to a remote URL (ie. anything with a method such as http in front of it), Apache HTTP Server will send a redirect to the client to tell it where to find the document, even if the document ends up being on the same server. This has several implications, the most important being that the client will not receive the original error status code, but instead will receive a redirect status code. This in turn can confuse web robots and other clients which try to determine if a URL is valid using the status code.