Setting Cookie Secure Flag – Apache

Method

Add the following line into section 1(Global Environment) of httpd.conf, this line will load the headers_module module, which provides directives to control and modify HTTP request and response headers.

LoadModule headers_module modules/mod_headers.so

After loading the headers_module module, add the following line into section 3(Main Server Config) of httpd.conf

Header edit Set-Cookie ^(.*)$ $1;Secure

Reference

https://www.owasp.org/index.php/SecureFlag