Scripts with extension .gz fail to load <script type="application/javascript" src="script.js.gz"></script> TODO same with CSS, img, etc.? Applications ✅ IE11 ✅ Safari See also Bug with the latest security updated - compressed script files don't work | Microsoft Connect BigSmoke » Safari: don’t give gzipped content a .gz extension gzip - Gzipped javascript not being served properly - Stack Overflow