How does zuul directly perform client-side load balancing in spring boot2 cloud?

how does 1.zuul directly perform client-side load balancing in spring boot2 cloud?
2. Environment: spring boot 2 spring cloud,zuul do gateway
3. Want to implement: how can two same consumer producers ab,a have one more ResquestMapping, than b to access the service in zuul if b is polled, b has no service so it will directly access a service at the zuul layer, and then return the information to the client?
4. Other: I don"t know if I misconfigured ribbon or how. There is no following configuration in spring boot2

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ribbon:
-number of sharp retries on the current instance
MaxAutoRetries: 1
-number of sharp switch instance retries
MaxAutoRetriesNextServer: 2
-timeout for sharp request processing
ReadTimeout: 60000
-sharp request connection timeout
ConnectTimeout: 60000
-sharp retries all operation requests
OkToRetryOnAllOperations: true

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea8ce1-1f03.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea8ce1-1f03.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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