ABAKUS

ErrorDocument 404 https://www. xy.com/404.htm
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteCond %{HTTP_HOST} !^$
RewriteRule ^(.*) https://www.%{HTTP_HOST}/$1 [R=301]

Verification status: NOT VERIFIED
Last attempt Jul 23, 2006: We've detected that your 404 (file not found) error page returns a status of 200 in the header

Bartenbach hat geschrieben:

ErrorDocument 404 https://www. xy.com/404.htm
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteCond %{HTTP_HOST} !^$
RewriteRule ^(.*) https://www.%{HTTP_HOST}/$1 [R=301]

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 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.