Now only non-parable PUT requests return a stream resource.

It's easier to find errors in the code if an exception is thrown.

It's easier to find errors in the code if an exception is thrown.

It's easier to find errors in the code if an exception is thrown.

@PublicPage - No user logon is expected
@NoAdminRequired - the login user requires no admin rights
@NoCSRFRequired - the incoming request will not check for CSRF token