How to conditionally override a header in nginx only if a cookie exist?

How to conditionally override a header in nginx only if a cookie exist?

if-statement cookies nginx http-headers ngx-http-rewrite-module

nginx

Nginx Block User-Agent "-"

nginx http-headers user-agent access-control ngx-http-rewrite-module

nginx

Remove index.php from Joomla! URLs with NGINX

nginx joomla url-rewriting url-redirection ngx-http-rewrite-module

nginx