WARNING: Unsupported BIO ctrl call

[petr-fischer]

When I run, for example, this code (just get something on HTTPS with HTTP::Client):

require "http"                                                                                                                                                  
pp HTTP::Client.get("https://www.example.com").headers

this warning occurs in the run output:

WARNING: Unsupported BIO ctrl call (73)
WARNING: Unsupported BIO ctrl call (73)
WARNING: Unsupported BIO ctrl call (73)
WARNING: Unsupported BIO ctrl call (73)
WARNING: Unsupported BIO ctrl call (73)
...
WARNING: Unsupported BIO ctrl call (76)
WARNING: Unsupported BIO ctrl call (76)
...

$ crystal --version
Crystal 1.4.1 [b7377c041] (2022-04-22)

LLVM: 10.0.0
Default target: x86_64-unknown-linux-gnu

$ openssl version
OpenSSL 3.0.2 15 Mar 2022 (Library: OpenSSL 3.0.2 15 Mar 2022)

$ cat /etc/os-release
PRETTY_NAME="Ubuntu 22.04 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04 (Jammy Jellyfish)"
VERSION_CODENAME=jammy

[Blacksmoke16]

Seems somewhat related to openssl/openssl#5253, as that's what added BIO_CTRL_GET_KTLS_SEND which is what 73 represents.

If I had to guess, I'd say this is related to #11231 in that Crystal bindings weren't updated to handle this context.