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mod_proxy_ajp can also be trivially swapped-out with mod_proxy_http just by changing the URLs in your ProxyPass and ProxyPassReverse directives to say http:// (or https://) instead of ajp://. This might help you if you need to switch protocols for debugging purposes or if you suddenly need switch to HTTPS to secure the traffic without any external configuration (e.g. stunnel or VPN). (See AJP with stunnel.)

mod_proxy also supports ProxyPassMatch which lets you use regular expressions in your URL mappings, which mod_jk's JkMount does not (though you *can* use <LocationMatch> along with SetHandler in order to achieve the same result, it's a cleaner configuration with mod_proxy).

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