3.1.5.1.1 Extensions to GET and POST

File system clients need to obtain file properties together with the contents of the file.

An X-MSDAVEXT: PROPFIND header in the request from the client instructs the server to return the properties of the file together with the content of the file. If the server returns a content type that is not multipart/MSDAVEXTPrefixEncoded in the response, the client SHOULD treat this as an error.<13>

This header SHOULD be included only on GET commands that are targeted to servers that support these extensions, as advertised by an X-MSDAVEXT: 1 header in the OPTIONS command response from the server.<14>