There are no cache instructions…

There are no cache instructions on SVGs on the CDN, could you please add some on?

$ curl -I https://s.w.org/images/core/emoji/2/svg/1f937.svg
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Type: image/svg+xml
Date: Wed, 20 Jul 2016 05:44:19 GMT
Last-Modified: Mon, 18 Jul 2016 07:14:38 GMT
Server: ECS (syd/EBEC)
X-Cache: HIT
X-Frame-Options: SAMEORIGIN
X-nc: MISS lax 186
Content-Length: 4618

The cache can be set to a long time without causing problems, I’m fine with a month or more.

Also, I’m not sure if it’s possible/desired to compress the data, but I imagine SVGs will compress moderately well.