* Proxy remote images with a content-type of `image/*`
-* 404s for anything other than a 200, 301, 302 or 304 HTTP response
+* 404s for anything other than a 200, 301, 302, 303, 304 or 307 HTTP response
* Disallows proxying to private IP ranges
At GitHub we render markdown and replace all of the `src` attributes on the `img` tags with the appropriate URL to hit the proxies. There's example code for creating URLs in [the tests](https://github.com/atmos/camo/blob/master/test/proxy_test.rb).