Report version of
libcurl in use.
A character string, with value the
libcurl version in use or
"" if none is. If
libcurl is available, has attributes
A character string naming the SSL implementation
and version, possibly
A character string naming the
A character vector of the names of supported protocols, also known as ‘schemes’ when part of a URL.
extSoftVersion for versions of other third-party
url for functions which (optionally) use
http://curl.haxx.se/docs/ssl-compared.html for more details on
SSL versions. Normally
libcurl used with R uses
SecureTransport on macOS, OpenSSL on Windows and GnuTLS, NSS or OpenSSL
on Unix-alikes. (At the time of writing Debian-based Linuxen use
GnuTLS, RedHat-based ones use NSS.)
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