Manual:$wgUseETag/en

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 this thread) but doesn’t remove it when MediaWiki send itself a gzip version (see Manual:$wgUseGzip). This issue is solved from nginx 1.7.3 (bug #377: etag не отдается с gzip).