RMS 4.9 It is uncertain whether a resource ever existed at the requested URL
It is recommended that this status message is used only as a last resort as it presents a poor experience to users of the website. More specific responses should be used where the history of the resource is know.
HTTP status: 404 Not found
HTTP headers: Standard content delivery headers only are required for this situation
Content element is to contain the following text:
The history of the requested address is unknown
The requested address may contain errors or a resource may have existed for this address that has since been moved or removed.
An optional custom message can be included here.
Please contact us if you require further assistance with your request.
Note: This scenario represents a state of uncertainty; therefore the message reflects this uncertainty. If the history of the resource was certain, a more appropriate message could be chosen instead (for example: if it is certain that a resource never existed for the requested URL, use RMS 4.7 - A common typographical error for an address).