How to redirect visitors to unique page cache directories based on subdomain via Apache

We have a rails app which is handling requests from both m.host.com and host.com. If the request comes in to m.host.com, the rails app page cache dir is /public/cache/m/, and if the request comes to host.com the page cache dir is /public/cache/www/.

The problem is that the first RewriteCond is being matched for both requests to m.host.com and host.com.

# if the `HTTP_HOST` starts with "m." (m.host.com), look for the cache in /cache/m/...
RewriteCond %{HTT开发者_StackOverflowP_HOST} ^m\..*
RewriteRule ^([^.]+)/$ /cache/m/$1.html [QSA]
RewriteRule ^([^.]+)$ /cache/m/$1.html [QSA]

# if not, look for the cache in /cache/www/...
RewriteCond %{HTTP_HOST} !^m\..*
RewriteRule ^([^.]+)/$ /cache/www/$1.html [QSA]
RewriteRule ^([^.]+)$ /cache/www/$1.html [QSA]

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Give this a try:

# if the `HTTP_HOST` starts with "m." (m.host.com), look for the cache in /cache/m/...
RewriteCond %{HTTP_HOST} ^m\.
RewriteRule ^([^.]+)/?$ /cache/m/$1.html [L,QSA]

# if not, look for the cache in /cache/www/...
RewriteCond %{HTTP_HOST} !^m\.
RewriteRule ^([^.]+)/?$ /cache/www/$1.html [L,QSA]

By adding the 'L' to the parameters you tell the parser that the current RewriteRule is the last one applied to the current request.

Also a RewriteCond only applies to the single next RewriteRule, that's why your rewrites were the same for any request, the parser would apply both second RewriteRules to the request.