Cache-control: no-cache instead of Expires: 0
Cache-control: no-cache instead of Expires: 0

6. Versioning

    All successful GET, HEAD, PUT and DELETE requests MUST return an
    'ETag' header [HTTP] with, in the case of GET and HEAD the current
    version, in the case of PUT, the new version, and in case of DELETE,
    the version that was deleted. All successful GET requests MUST
    return a 'Cache-Control: no-cache' header. PUT and DELETE requests
    MAY have an 'If-Match' request header [COND], and MUST fail with a
    412 response code if that does not match the document's current
    version.

untitaker/mysteryshack,untitaker/mysteryshack,untitaker/mysteryshack