This function queries the Curl library to provide information about its characteristics when it was compiled. This tells the user about its capabilities and can be used to determine strategies.
curlVersion(id = 0)A list
integer giving the number of this libcurl, 0 is FIRST, 1 is SECOND, 2 is THIRD
the version identifier as a string, e.g. "7.12.0"
the value as an integer
the machine on which the libcurl was configured/built.
a named integer vector of bits indicating what features of libcurl were configured and built into this version. These are features such as ipv6, ssl, libz, largefile, ntlm (Microsoft "authorization").
the string identifying the SSL version.
the number identifying the SSL version
the string identifying the version of libz.
a character vector of the supported HTTP protocols, e.g. http, https, ftp, ldap, gopher, telnet
name of the asynchronous DNS (domain name service) lookup library. This is often simply the empty string indicating it is not there.
the number for the ares library
the name of the IDN (internationalized domain names)
library being used. This field only appears in version 3 of libcurl.
If you are using version 2 (e.g. curl-7.11.2), this will be
NA.
An empty string indicates that the field is present, but has no value.
See the man page for curl_version_info
for a description of these fields.
features in R is a named integer vector
detailing the different features.
an integer value between 0 and 3 inclusive. The idea is that one specifies the identifier for the version of interest. In fact, all values seem to yield the same result.
Duncan Temple Lang
Curl homepage https://curl.se/
curl_version_info in the libcurl documentation.