Global response headers are pieces of information that are sent in the header portion on all page responses. If a Page Item is configured to send additional response headers, then those will be sent for requests of that page only. In the case that a Page Item is configured to send a response header that exists as a global response header then the Page Item’s response header value is used instead. These content headers are system generated and cannot be modified: “date”, “content-length”, “content-encoding” and “server”.