[andrewstuart2]

Uh, `Last-Modified: $now` doesn't seem to be in any RFC I can find, or any other credible sources I could find via Google for that matter.

Definitely not in RFC 1123, though.

[ademarre]

I'm sure they're using "$now" as a variable placeholder for the example, it's not meant to be read as a literal header. (In PHP variables begin with $.) They're not very clear on that though, so your point is valid.

[dedalus]

Its a PHP endpoint that generates the timestamp for $now