T:\>HEAD https://www.perl-community.de/bat/poard/xml_messages_rss -H "If-Modified-Since: Sat, 03 Mar 1973 09:46:40 GMT"
200 OK
Connection: close
Date: Fri, 25 Oct 2019 18:40:53 GMT
Server: Apache
Vary: Accept-Encoding
Content-Type: application/rss+xml; charset=utf-8
Expires: Fri, 25 Oct 2019 18:40:53 GMT
Last-Modified: Fri, 25 Oct 2019 04:41:43 GMT
Client-Date: Fri, 25 Oct 2019 18:40:53 GMT
Client-Peer: 188.40.117.67:443
Client-Response-Num: 1
Client-SSL-Cert-Issuer: /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
Client-SSL-Cert-Subject: /CN=www.perl-community.de
Client-SSL-Cipher: AES256-SHA
Client-SSL-Socket-Class: IO::Socket::SSL
X-No-Archive: yes


T:\>HEAD https://www.perl-community.de/bat/poard/xml_messages_rss -H "If-Modified-Since: Sat, 03 Mar 1973 09:46:39 GMT"
304 Not modified
Connection: close
Date: Fri, 25 Oct 2019 18:41:01 GMT
Server: Apache
Vary: Accept-Encoding
Client-Date: Fri, 25 Oct 2019 18:41:00 GMT
Client-Peer: 188.40.117.67:443
Client-Response-Num: 1
Client-SSL-Cert-Issuer: /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
Client-SSL-Cert-Subject: /CN=www.perl-community.de
Client-SSL-Cipher: AES256-SHA
Client-SSL-Socket-Class: IO::Socket::SSL


T:\>HEAD https://www.perl-community.de/bat/poard/xml_messages_rss -H "If-Modified-Since: Sat, 03 Mar 1973 09:46:41 GMT"
200 OK
Connection: close
Date: Fri, 25 Oct 2019 18:41:11 GMT
Server: Apache
Vary: Accept-Encoding
Content-Type: application/rss+xml; charset=utf-8
Expires: Fri, 25 Oct 2019 18:41:11 GMT
Last-Modified: Fri, 25 Oct 2019 04:41:43 GMT
Client-Date: Fri, 25 Oct 2019 18:41:11 GMT
Client-Peer: 188.40.117.67:443
Client-Response-Num: 1
Client-SSL-Cert-Issuer: /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
Client-SSL-Cert-Subject: /CN=www.perl-community.de
Client-SSL-Cipher: AES256-SHA
Client-SSL-Socket-Class: IO::Socket::SSL
X-No-Archive: yes