Session not replicated on session creation with Spring Boot, Session, and Redis

Question

I\'m attempting to implement a microservices architecture using Spring Cloud\'s Zuul, Eureka, and my own services. I have multiple services that have UIs and services and each c

Answer 1

Thanks to shobull for pointing me to Justin Taylor's answer to this problem. For completeness, I wanted to put the full answer here too. It's a two part solution:

1. Make Spring Session commit eagerly - since spring-session v1.0 there is annotation property @EnableRedisHttpSession(redisFlushMode = RedisFlushMode.IMMEDIATE) which saves session data into Redis immediately. Documentation here.

2. Simple Zuul filter for adding session into current request's header:

   import com.netflix.zuul.ZuulFilter;
   import com.netflix.zuul.context.RequestContext;
   import javax.servlet.http.HttpSession;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.session.Session;
   import org.springframework.session.SessionRepository;
   import org.springframework.stereotype.Component;
   
   @Component
   public class SessionSavingZuulPreFilter extends ZuulFilter {
       @Autowired
       private SessionRepository repository;
   
       private static final Logger log = LoggerFactory.getLogger(SessionSavingZuulPreFilter.class);
   
       @Override
       public String filterType() {
           return "pre";
       }
   
       @Override
       public int filterOrder() {
           return 1;
       }
   
       @Override
       public boolean shouldFilter() {
           return true;
       }
   
       @Override
       public Object run() {
           RequestContext context = RequestContext.getCurrentContext();
   
           HttpSession httpSession = context.getRequest().getSession();
           Session session = repository.getSession(httpSession.getId());
   
           context.addZuulRequestHeader("Cookie", "SESSION=" + httpSession.getId());
   
           log.trace("ZuulPreFilter session proxy: {}", session.getId());
   
           return null;
       }
   }
   

Both of these should be within your Zuul Proxy.