聊聊eureka instance的overriddenstatus

        /**
         * Sets the status overridden by some other external process.This is
         * mostly used in putting an instance out of service to block traffic to
         * it.
         *
         * @param status the overridden {@link InstanceStatus} of the instance.
         * @return @return the {@link InstanceInfo} builder.
         */
        public Builder setOverriddenStatus(InstanceStatus status) {
            result.overriddenstatus = status;
            return this;
        }

    public enum InstanceStatus {
        UP, // Ready to receive traffic
        DOWN, // Do not send traffic- healthcheck callback failed
        STARTING, // Just about starting- initializations to be done - do not
        // send traffic
        OUT_OF_SERVICE, // Intentionally shutdown for traffic
        UNKNOWN;

        public static InstanceStatus toEnum(String s) {
            if (s != null) {
                try {
                    return InstanceStatus.valueOf(s.toUpperCase());
                } catch (IllegalArgumentException e) {
                    // ignore and fall through to unknown
                    logger.debug("illegal argument supplied to InstanceStatus.valueOf: {}, defaulting to {}", s, UNKNOWN);
                }
            }
            return UNKNOWN;
        }
    }

curl -i -X PUT http://localhost:8761/eureka/apps/client1/127.0.0.1:client1:8081/status?value=OUT_OF_SERVICE
HTTP/1.1 200
Content-Type: application/xml
Content-Length: 0
Date: Wed, 16 May 2018 06:52:29 GMT

curl -i -X DELETE http://localhost:8761/eureka/apps/client1/127.0.0.1:client1:8081/status
HTTP/1.1 200
Content-Type: application/xml
Content-Length: 0
Date: Wed, 16 May 2018 06:54:30 GM