thor533 opened a new issue, #9238:
URL: https://github.com/apache/apisix/issues/9238

   ### Description
   
   I used the weighted polling algorithm to set a route, including multiple 
upstream routes, one of which could not work. When I used postman to access the 
route, the log showed that the node down was hit, but the correct result was 
always returned. I did not enable the health check, could you please help to 
explain this phenomenon?
   
   the access.log is :
   
![图片](https://user-images.githubusercontent.com/62246176/229731441-f430fec5-764c-4d33-a405-30df478740bf.png)
   the error.log is :
   
![图片](https://user-images.githubusercontent.com/62246176/229731539-76cd3c22-e417-49ac-8f2e-09aeb84ccde1.png)
   
   the postman result is :
   
![图片](https://user-images.githubusercontent.com/62246176/229731664-383b4f74-afe4-4836-aa55-6acc38de6275.png)
   
   Normally, no data should be returned, 502 should be returned
   
   ### Environment
   
   - APISIX version (run `apisix 2.15-alpine`):
   - Operating system (run `uname -a`):
   - OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
   - etcd version, if relevant (run `curl 
http://127.0.0.1:9090/v1/server_info`):
   - APISIX Dashboard version, if relevant:
   - Plugin runner version, for issues related to plugin runners:
   - LuaRocks version, for installation issues (run `luarocks --version`):
   


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