CURLOPT_SHARE for alt-svc #4476
Description
I did this
There is no CURLOPT_SHARE option for ALTSVC (see https://ec.haxx.se/libcurl-sharing.html). Ideally, the alt-svc cache (configured using the CURLOPT_ALTSVC and CURLOPT_ALTSVC_CTRL options) should be shareable in the same way as the cookie and DNS caches.
I expected the following
A way to share the ALTSVC cache using CURLOPT_SHARE.
curl/libcurl version
$ curl -V
curl 7.66.0 (x86_64-pc-linux-gnu) libcurl/7.66.0 OpenSSL/1.1.1d zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libssh2/1.9.0 nghttp2/1.39.2 librtmp/2.3
Release-Date: 2019-09-11
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtmp rtsp scp sftp smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli HTTP2 HTTPS-proxy IDN IPv6 Largefile libz Metalink NTLM SSL TLS-SRP UnixSockets
operating system
Linux