Try to use SSL if the server supports it.
diff --git a/util.c b/util.c
index 2417be7..54bb80c 100644
--- a/util.c
+++ b/util.c
@@ -329,6 +329,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, resp_hdr_cb);
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &hi);
+ curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);
if (userpass) {
curl_easy_setopt(curl, CURLOPT_USERPWD, userpass);
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);