Using GWT 2.10.0 and super dev mode the cache.js files are uncompressed  #9765

GWT version: 2.10.0
Browser (with version): all browsers
Operating System: tested in Windows and Macos

Description

After upgrading from GWT 2.8.2. to 2.10.0 the cache.js files in Super Dev Mode are no longer served as gzip files. They are uncompressed instead.
This leads to higher load times of the application in SDM.

Steps to reproduce

Start Super Dev Mode in a GWT 2.10.0 project and check the network tab in your browser. Although the browser allows gzip, the file is transferred uncompressed. See the response in the browsers network tab.

Links to further discussions

We discussed this on gitter and @tbroyer shared this link: https://github.com/eclipse/jetty.project/blob/jetty-9.4.44.v20210927/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/GzipFilter.java