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Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=2166244

Description of problem:

# curl -k -I -H "Accept-Encoding: gzip" https://localhost/webpack/vendor-950b729ed5965c2a80e1.js
HTTP/2 200 
date: Wed, 01 Feb 2023 09:10:12 GMT
server: Apache
last-modified: Tue, 24 Jan 2023 16:16:09 GMT
etag: "a481-5f304d562e440" 
accept-ranges: bytes
content-length: 42113
content-type: application/javascript

Version-Release number of selected component (if applicable):
6.13.0

How reproducible:
100%

Steps to Reproduce:
1. curl -k -I -H "Accept-Encoding: gzip" <URL_of_asset>

Actual results:
- No "content-encoding: gzip" header
- content-length shows the "full" size of the file, not the gziped size

Expected results:

# curl -k -I -H "Accept-Encoding: gzip" https://localhost/webpack/vendor-950b729ed5965c2a80e1.js
HTTP/2 200 
date: Wed, 01 Feb 2023 09:12:25 GMT
server: Apache
vary: Accept-Encoding
last-modified: Tue, 24 Jan 2023 16:16:09 GMT
etag: "3748-5f304d562e440" 
accept-ranges: bytes
content-length: 14152
content-encoding: gzip
content-type: text/javascript

Additional info: