I just realized what the problem is. Firstly, there seems to be a difference between the versions of IIS (IIS6 and IIS10 in my case), in which some (newer) versions are system.webServer/httpCompressionon the site, and not just on the server. I thought the reason was that dynamic caching did not work on our dev server, but it worked on a colleague computer with IIS10.
, , gzip , - - IE, IE10, . , IE. IE10, . IE11, dev, gzip .
IE...