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* In case the failureType coming from Hystrix is SHOSRTCIRCUIT, then ServiceUnavailableException will be thrown. That exception provides HTTP 503 to the original service consumer. Moreover, HystrixGatewayFilterFactoryTests have been enriched so that the aforementioned case is tested and verified. * The hystrixFilterServiceUnavailable test of HystrixGatewayFilterFactoryTests no longer force-closes the circuit in order not to impact any subsequent tests (see also the comment: https://github.com/spring-cloud/spring-cloud-gateway/pull/1230#pullrequestreview-272440126)