charon.plugins.curl.redir = -1
	Maximum number of redirects followed by the plugin, set to 0 to disable
	following redirects, set to -1 for no limit.

charon.plugins.curl.tls_backend =
	The SSL/TLS backend to configure in curl if multiple are available.

	The SSL/TLS backend to configure in curl if multiple are available (requires
	libcurl 7.56 or newer). A list of available options is logged on level 2 if
	nothing is configured. Similar but on level 1 if the selected backend isn't
	available.