$raw - a raw vector of the received resource (may be saved
to a file using writeBin to re-create the original)
$data - the raw vector converted to a character string (if
the served content was a recognised text format), allowing further parsing
within R as html, json, xml etc., or NULL otherwise (if the content was a
binary file etc.)
Redirects
In interactive sessions, will prompt upon receiving a redirect location
whether to follow or not (default: yes). In non-interactive sessions,
redirects are never followed.
TLS Support
Connecting to secure https sites is supported if your version of the NNG
library was built with TLS support (using Mbed TLS) and the environment
variable 'NANONEXT_TLS' was set when installing the package e.g. by
Sys.setenv(NANONEXT_TLS=1). Note: not applicable for Windows systems.