curl mutually exclusive --ntlm and --negotiate option

Hi all,

I've a simple questions regarding --ntlm and --negotiate option. In the manual for ntlm, it is written that "--ntlm requires that libcurl is built to support TLS.  This option is mutually exclusive with --basic, --negotiate, --digest and --anyauth.  See also --proxy-ntlm."

I find regardless a lot of examples on web search that use the two options together for instance "curl -X POST -k -v --ntlm --negotiate -u usernamehere -F "csv=@pt_update.csv" -F "op=add" "https://google.com/csv_import""

My questions is:
- Are --ntlm and --negotiate exclusive? if yes, what's the choosen one if both options are provided?
- mutual exclusive options like negotiate and ntlm seems to be accepted in cli (I can write "curl --negotiate --ntlm --user "" --verbose foo.com" without error). Is the "mutual exclusive" just a doc hint or is there any mechanism that raises an error if user uses mutual exclusives option?

Thanks a lot,

Jean-Christophe


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