Git push shows warning

The fix for #322 (closed) works OK. However, when pushing my solution as a make-believe student, I get the following.

Enumerating objects: 4, done.
Counting objects: 100% (4/4), done.
Writing objects: 100% (3/3), 254 bytes | 254.00 KiB/s, done.
Total 3 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
remote: curl: option --fail-with-body: is unknown
remote: curl: try 'curl --help' or 'curl --manual' for more information
remote: curl: option --fail-with-body: is unknown
remote: curl: try 'curl --help' or 'curl --manual' for more information
remote:   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
remote:                                  Dload  Upload   Total   Spent    Left  Speed
remote: 100    19  100    19    0     0    452      0 --:--:-- --:--:-- --:--:--   463
remote: "Upload completed."
To https://tms.inf.elte.hu/git-dev/17/stud01/w3242d3b8d70cce90b034985c5
   9530610..7af8157  master -> master

Seems harmless enough, but maybe it is related to some important check that would reject the student's solution in some cases. The fail bit in the option name suggests so.