When I execute w3m on GitHub, e.g. w3m https://github.com/ or just by following a link, w3m displays

gzip: stdin: not in gzip format

This occurs under both Debian/unstable (w3m 0.5.3+git20230121-2.1) and Termux/Android (w3m 0.5.3.20230121). Note that lynx and elinks do not have any such issue.