Can ProxyPass and ProxyPassReverse work in htaccess?

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You cannot use a ProxyPass in an htaccess file. The documentation says it is only applicable in the context:

Context: server config, virtual host, directory

which excludes htaccess (you can’t have a <Directory> block in htaccess). However, you can use a ProxyPassReverse to internally rewrite the Location field of proxied requests that cause a redirect. You’ll just need to use mod_rewrite’s P flag to proxy instead of ProxyPass. So something like:

RewriteEngine On
RewriteRule ^/?img/(.*)$ http://internal.example.com/img/$1 [L,P]
RewriteRule ^/?app/(.*)$ http://internal.example.com/app/$1 [L,P]

ProxyPassReverse / http://internal.example.com/

Just to be clear, you cannot use ProxyPass or ProxyPassReverse in the htaccess file, but you can use ProxyPassReverse with mod_rewrite rules that utilize the P flag.

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