Deliver compressed files, when the request has Accept-Encoding: gzip, deflate, br

[dilyanpalauzov]

When requesting a web page, the browser sends the header Accept-Encoding: gzip, deflate, br. The web server can then reduce the transferred data, by returning compressed files and the header Content-Encoding:.

As shown at #1432 the server does generate gz files, but these are not returned when the request has the Accept-Encoding: gzip, deflate, br header in OH 4.1.1. The files are returned, when the request URI ends in .gz.