LIB-165 and how it was built, the exception generated, is set to fill up with the next exception followed by the self catched one. This will render a longer exception message than sometimes necessary (see below). As of 6.0.20, these types of exception should be shortened down to the first message only, and if needed the use of a flag to extend it should be added instead.
MODULE_CURL exception from soapClient:  HTTP-Request-Exception: 401 Unauthorized
SoapClient::SoapClient(https://test.resurs.com/ecommerce-test/ws/V4/SimplifiedShopFlowService?wsdl): failed to open stream: HTTP request failed! HTTP/1.1 401 Unauthorized
SOAP-ERROR: Parsing WSDL: Couldn't load from '<url>' : failed to load external entity "<url>"