How to solve the Website internal server error from the following apache error log”Invalid command ‘Header’ perhaps misspelled or defined by a module not included in the server configuration” Date: 16-12-2020 Step 1: You are getting above error due to header module is not enabled in Apache on Ubuntu. You… Continue Reading How to solve the Website internal server error from the following apache error log”Invalid command ‘Header’ perhaps misspelled or defined by a module not included in the server configuration”