I did this

$ curl "" --silent www.example.com

And I saw an error:

curl: option : blank argument where content is expected
curl: try 'curl --help' for more information

I expected the following

Curl to run as if I had passed it curl --silent www.example.com based on #13144 (I think it was also introduced with 07bcae8), though similar to there I'm not sure if this is a bug or intentional behaviour but thought I'd post all the same for visibility, given there is a behaviour change.

building at 07bcae89d5d0090f1d11866d5f9c98c3720a2838~ (i.e. f59223f) and I see the following behaviour:

$ ./src/curl "" www.example.com >/dev/null
curl: (3) URL rejected: Malformed input to a URL function
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1256  100  1256    0     0   7399      0 --:--:-- --:--:-- --:--:--  7431
$ ./src/curl "" --silent www.example.com >/dev/null

I.e. the request to www.example.com is made in both cases and the --silent option is used in the second.

I noticed this behaviour as a result of karancode/kustomize-github-action#46. The root cause of that is the curl invocation https://github.com/karancode/kustomize-github-action/blob/883a86ec3535e4e7d0fe6450a85f8325c97d2a7b/src/entrypoint.sh#L54 where ${with_token[@]}" being empty it will result in a "" in the args.

curl/libcurl version

$ curl --version
curl 8.8.0 (x86_64-pc-linux-gnu) libcurl/8.8.0 OpenSSL/3.3.1 zlib/1.3.1 brotli/1.1.0 zstd/1.5.6 libidn2/2.3.7 libpsl/0.21.5 libssh2/1.11.0 nghttp2/1.62.1 nghttp3/1.3.0
Release-Date: 2024-05-22
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTP3 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd

Tested with the same result at current master (0473905)

operating system

Arch Linux 6.6.32-1-lts