Right. Old expiry header is actually how "do not cache this" is often encoded. Some of these Internet conventions are a bit crufty.
X-Powered-By does indeed say Composr, but I don't want to change it - only real techies are checking it, so I think it is reasonable for us to tell the correct technical value here, rather than a branding value.
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#2517 - HTTP Response Headers expiry and debranding
X-Powered-By does indeed say Composr, but I don't want to change it - only real techies are checking it, so I think it is reasonable for us to tell the correct technical value here, rather than a branding value.