Manual:$wgUseETag

Details
Whether MediaWiki should send an ETag header. Seems to cause broken behavior with Squid 2.6, see . Note that nginx (before 1.7.3) removes the ETag header when it does itself the HTTP gzip compression (see for example [http://forum.nginx.org/read.php?2,242807,242809 this thread]) but doesn’t remove it when MediaWiki send itself a gzip version (see ). This issue is solved from nginx 1.7.3 ([https://trac.nginx.org/nginx/ticket/377 bug #377: etag не отдается с gzip]).