Sometimes my browser issues /?= instead of simply /, which results in the query string being empty in both cases. However, the W3TC RewriteCond checks for RewriteCond %{QUERY_STRING} ="" and thus fails on ?=. I recommend using
RewriteCond %{QUERY_STRING} ^=?$
instead.
Also, some performance tips you might want to implement:
- Use ^ instead of .* on RewriteRule
- Use the [OR] operator instead of having multiple rules. For example you can replace
RewriteCond %{HTTPS} =on
RewriteRule .* - [E=W3TC_SSL:_ssl]
RewriteCond %{SERVER_PORT} =443
RewriteRule .* - [E=W3TC_SSL:_ssl]with
RewriteCond %{HTTPS} =on [OR]
RewriteCond %{SERVER_PORT} =443
RewriteRule ^ - [E=W3TC_SSL:_ssl]