Enable mod_proxy_http module in Apache

In Apache of Ubuntu, the mod_proxy_http module that provides the proxy function by HTTP / HTTPS is not enabled by default, so enable it.

sudo a2enmod proxy_http

Please Restart Apache for the settings to take effect.

Please refer to the following articles for how to enable / disable Apache modules.

Note that mod_proxy_http depends on mod_proxy.

Apache error message when mod_proxy_http does not exist

Example Apache error message when mod_proxy_http does not exist.

Invalid command'<Proxy', perhaps misspelled or defined by a module not included in the server configuration

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