This test endpoint returns Content-Type: application/json
Without gzip enabled header:
$ wget -qO test https://testendpoint
$ file test
test: ASCII text, with very long lines, with no line terminators
$ du -b test
7307 test
Setting the gzip enabled header:
$ wget --header="accept-encoding: gzip" -qO test.gz https://testendpoint
$ file test.gz
test.gz: gzip compressed data, from Unix
$ du -b test.gz
1694 test.gz
Telling the server that wget can accept gzip compressed content results in 77% reduction in bytes transferred.