Returning CURLSTS_FAIL from HSTSREADFUNCTION does not abort the request

[JCMais]

I did this

Created a new easy handle, and set the HSTSREADFUNCTION option to a callback that always returns CURLSTS_FAIL.

I expected the following

The request is aborted as the HSTSREADFUNCTION callback is called before the transfer is made.

What happens is that the request is not aborted. this happens when using the multi interface and also when using the easy handle directly.

curl/libcurl version

curl 7.78.0 (x86_64-pc-linux-gnu) libcurl/7.78.0 OpenSSL/1.1.1k zlib/1.2.11 brotli/1.0.9 zstd/1.4.9 libidn2/2.1.1 libssh2/1.9.0 nghttp2/1.41.0 OpenLDAP/2.4.47
Release-Date: 2021-07-21
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp 
Features: alt-svc AsynchDNS brotli Debug HSTS HTTP2 HTTPS-proxy IDN IPv6 Largefile libz NTLM NTLM_WB SSL TLS-SRP TrackMemory UnixSockets zstd

operating system

uname -a

Linux JCM-PC 4.19.128-microsoft-standard #1 SMP Tue Jun 23 12:58:10 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

lsb_release -a

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.5 LTS
Release:        18.04
Codename:       bionic

gcc: 7.5.0

[JCMais]

Thanks for fixing this @bagder!