netrc not respected if login token is not present

[centromere]

I did this

➜  ~ cat netrc
machine foo.cachix.org password foo
➜  ~ /usr/local/opt/curl/bin/curl -v --netrc-file netrc https://foo.cachix.org/nix-cache-info
...
> GET /nix-cache-info HTTP/2
> Host: foo.cachix.org
> user-agent: curl/7.83.1
> accept: */*
>
...
< HTTP/2 401
...

I expected the following

> GET /nix-cache-info HTTP/2
> Host: foo.cachix.org
> authorization: Basic IiI6Zm9v
> user-agent: curl/7.83.1
> accept: */*
>
...
< HTTP/2 200
...

It works when

➜  ~ cat netrc
machine foo.cachix.org login "" password foo
➜  ~ /usr/local/opt/curl/bin/curl -v --netrc-file netrc https://foo.cachix.org/nix-cache-info
...
> GET /nix-cache-info HTTP/2
> Host: foo.cachix.org
> authorization: Basic IiI6Zm9v
> user-agent: curl/7.83.1
> accept: */*
>
...

curl/libcurl version

➜  ~ /usr/local/opt/curl/bin/curl --version
curl 7.83.1 (x86_64-apple-darwin21.3.0) libcurl/7.83.1 (SecureTransport) OpenSSL/1.1.1o zlib/1.2.11 brotli/1.0.9 zstd/1.5.2 libidn2/2.3.2 libssh2/1.10.0 nghttp2/1.47.0 librtmp/2.3 OpenLDAP/2.6.2
Release-Date: 2022-05-11
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL TLS-SRP UnixSockets zstd

operating system

OSX 12.4, curl installed with homebrew.

[centromere]

Related: https://github.com/NixOS/nixpkgs/blob/7434c16611902553df66e5d600ff219fc44aa547/pkgs/tools/networking/curl/netrc-regression.patch

[bagder]

see #9066

[bagder]

Duplicate of #8653