On Fri, 2015-06-19 at 10:07 +0100, Chris Dent wrote: > * Are there additional relevant pros and cons for the two proposals? > * Are there additional proposals which can address the shortcomings > in either? On the latter question, would using the If-Modified-Since header[1] make any sense as a possible solution? That at least would be a standard HTTP convention for this sort of thing, and tends to match up with the semantics of a changes-since query parameter. [1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25 -- Kevin L. Mitchell <kevin.mitchell at rackspace.com> Rackspace