How to set up CORS in apache?

Question

Apache HTTP Server

.htaccess config

Header set Access-Control-Allow-Origin "*"

RewriteEngine On  
  # If an existing asset or directory is requested go to it as it is
  RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -f [OR]
  RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -d
  RewriteRule ^ - [L]

  # If the requested resource doesn't exist, use index.html
  RewriteRule ^ /index.html

when adding a header to allow CORS, the server starts giving a 500 error.