The Content-Location entity-header field may be used to supply the resource location for the entity enclosed in the message. In the case where a resource has multiple entities associated with it, and those entities actually have separate locations by which they might be individually accessed, the server should provide a Content-Location for the particular variant which is returned. In addition, a server SHOULD provide a Content-Location for the resource corresponding to the response entity.
Content-Location = "Content-Location" ":" ( absoluteURI | relativeURI )
If no Content-Base header field is present, the value of Content- Location also defines the base URL for the entity (see section 14.11).
The Content-Location value is not a replacement for the original requested URI; it is only a statement of the location of the resource corresponding to this particular entity at the time of the request. Future requests MAY use the Content-Location URI if the desire is to identify the source of that particular entity.
A cache cannot assume that an entity with a Content-Location different from the URI used to retrieve it can be used to respond to later requests on that Content-Location URI. However, the Content- Location can be used to differentiate between multiple entities retrieved from a single requested resource, as described in section 13.6.
If the Content-Location is a relative URI, the URI is interpreted relative to any Content-Base URI provided in the response. If no Content-Base is provided, the relative URI is interpreted relative to the Request-URI.