Invalid command ‘RequestHeader’ error occurs in the Linux server due to missing apache modules in our Linux server.
Invalid command 'RequestHeader', perhaps misspelled or defined by a
module not included in the server configurationTo fix this issue, just enable the “headers” module. If you are using Ubuntu just enable the module by running the following command:
sudo a2enmod headersAfter that. Restart apache
service apache2 restart
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Oct 20, 2025