Ajax Get method not supported in javascript because of using the jquery slim version. And use Jquery at head.

to activate the get method in ajax use the orginal version of jquery.

like

•  Support Get Method
  • https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js
• Not Supported Get Method
  •  https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.slim.min.js