HTTP-header "Cache-Control: public" for images and stylesheets

[Artem Popov]

As the whole Launchpad website is used over an SSL connection, lots of traffic could be minimized if "Cache-Control: public" HTTP-header would be present for images, scripts, stylesheets and probably librarian files.

Firefox 3 already supports Cache-Control header, and other browsers (and proxy servers) do this as well, so it might be a very nice feature for slow connections, etc.

Current workaround for speeding-up Launchpad in Firefox is to enable caching of all SSL content, which is certainly a bad thing to do.

This bug also looks related to bug 5456 (Expires: header)

[Artem Popov (artfwo)]

It looks like only the icons from the following screenshot are cached. HTTP headers example:

$ LANG=C wget -S https://edge.launchpad.net/@@/translation
--18:20:24-- https://edge.launchpad.net/@@/translation
           => `translation'
Resolving edge.launchpad.net... 91.189.90.244
Connecting to edge.launchpad.net|91.189.90.244|:443... connected.
HTTP request sent, awaiting response...
  HTTP/1.1 200 Ok
  Date: Sun, 27 Apr 2008 11:20:22 GMT
  Server: zope.server.http (HTTP)
  X-Powered-By: Zope (www.zope.org), Python (www.python.org)
  Last-Modified: Tue, 13 Feb 2007 10:00:38 GMT
  Content-Length: 693
  Cache-Control: public,max-age=86400
  Expires: Mon, 28 Apr 2008 11:20:22 GMT
  Content-Type: image/png
  Via: 1.0 edge.launchpad.net
  Keep-Alive: timeout=15, max=100
  Connection: Keep-Alive
Length: 693 [image/png]