Cache control header missing for HEAD request but works for GET.
curl -I https://localhost/support.html -k HTTP/1.1 200 OK Date: Thu, 19 Nov 2020 16:35:48 GMT Server: Apache Strict-Transport-Security: max-age=31536000; includeSubDomains X-Frame-Options: SAMEORIGIN Content-Security-Policy: frame-ancestors 'self' X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block Content-Type: text/html;charset=utf-8 Content-Language: en Using GET curl -i http://localhost/support.html Server: Apache Strict-Transport-Security: max-age=31536000; includeSubDomains X-Frame-Options: SAMEORIGIN Content-Security-Policy: frame-ancestors 'self' Last-Modified: Thu, 19 Nov 2020 18:57:55 GMT Accept-Ranges: bytes Content-Length: 206001 Expires: Fri, 20 Nov 2020 18:58:00 GMT Vary: Accept-Encoding X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff Cache-Control: public, max-age=86400 Content-Type: text/html Content-Language: en Rule Used : Header set Cache-Control "public, max-age=86400" this behavior happens when content is not cached on Apache request is passed to the backend server and on the response header is missing . when the content is cached on apache header is inserted properly. Thanks Rakesh
