While the curl based client is better in most respects, it requires
that libcurl be against with an asynchronous DNS resolver, such
as c-ares, in order to prevent blocking. As of now it Debian does
not ship with a version of curl with ares enabled. Fall back to the
simple client until this can be resolved.
Signed-off-by: Eric Callahan <arksine.code@gmail.com>
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