How do I apply gzip to http-server - http-server gzip

Not sure what exactly what you mean, but I'm assuming it's "what are the command lines to do this."

First tar the target files.   This is required because gzip will only work on one file at a time.

e.g. tar -cvf my-archive.tar /this/folder/*

Then gzip the tar file:

e.g. gzip -9v my-archive.tar

Sorry It tells me that gzip is not an internal or external command
How do I get gzip to be recognized from the command prompt

Gordon Cumming

Then you need to download the gzip software and install it on your system.

Under a Debian-based system (including Ubuntu):  apt-get install gzip

to gzip the Angular bundles down to a much smaller size

If you are thinking that this will make downloading the Angular files to the browser happen quicker, that isn't how it works.  'gzip' compression is negotiated and coordinated between the server and the browser.  If you gzip the files separately then they will arrive at the browser still gzipped and they will not be understood or readable by the browser.