spring gateway can not pass the same session id it received from frontend to backend service

[xinghen110]

Describe
I use spring gateway as a rou::ter for microservice system build by spring cloud, and spring session redis as shared session. I found that the session id frontend pass to gateway and gateway pass to backend service is different , so that the backend service can not get the right user session.

Gateway config
routes:
- id : user-service
uri: lb://user-service
predicates:
- Method=GET,POST
filters:
- SaveSession
- StripPrefix=1
- MapRequestHeader=cookie, cookie
- DedupeResponseHeader=Access-Control-Allow-Credentials Access-Control-Allow-Origin Set-Cookie
- RemoveResponseHeader=Set-Cookie

version
spring-cloud.version: Greenwich.SR6
spring-boot.version: 2.1.16.RELEASE
spring-cloud-alibaba.version: 2.1.2.RELEASE
spring-session-data-redis: 2.1.12.RELEASE

[catBigcat]

I advise you debug in ReactiveRedisSessionRepository.

@Override
public Mono<RedisSession> findById(String id) {
	String sessionKey = getSessionKey(id);

	// @formatter:off
	return this.sessionRedisOperations.opsForHash().entries(sessionKey). 

in redis ,sessionKey is spring:session:sessions:expires:45b4ebb1-2a29-4a75-bbca-eee75b9a54de.
but sessionKey is spring:session:sessions:expires:NDViNGViYjEtMmEyOS00YTc1LWJiY2EtZWVlNzViOWE1NGRl in gateway.

this cookie what'name is SESSION , encoded by base64 and not decoded in Netty.
Hope to help you。

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