Last modified: 2014-11-18 23:50:28 UTC
We don't want our POST responses to be cacheable. Apparently, IE does cache POST responses for certain response headers (which may even be allowed, see https://stackoverflow.com/questions/626057/is-it-possible-to-cache-post-methods-in-http ) so we need to set the headers such that no browser will cache it. Potentially, we could look at doing this in core.
See also https://gerrit.wikimedia.org/r/#/c/174023/ .