[ashark]

Plus, unless I'm missing something, the typical case is just:

    if accept==html then return html(template, data)
    else return json(data)

Which is sure as hell less work than setting up React/Angular and a bunch of other junk on your HTML frontend to consume JSON and turn it into HTML in the browser. Probably higher performance, too, since JSON-consuming HTML frontends in the wild don't seem to exhibit (putting it mildly) the performance improvements that AJAX originally promised—then again, that X was XML (and remember XHTML? I, for one, really liked it) so it's not necessarily AJAX's fault that we've decided to rube-goldberg up the web the way we have.