MicroService:

-   config-server: for configurations
-   eureka-naming-server: for registering of all microservices
-   api-gateway: for api-gateway: modify request header/params/authenticate etc:
    -   bestpractice:  pass all request through api-gateway for logging,auth,security etc
    -   resilence4j: for  rate-limiter, retry, circuit-breaker,bulkhead-concurrent calls
-   feign: for proxy controler to talk to different micro-service
-   netflix-eureka-client: to register to eureka server
-   load-balancer: through the eureka-server

Troubleshoot

- : Issue:   
    -   config-server port should be changed from default 8888 to anything else
    -   because when the config-server port it default 8888, 
        and we try to fetch http://localhost:8888/{application}/{profile}
        -   it tries to  fetch from http://localhost:8888/{application}/{profile} again and again
        -   because this url is available in {application}.properties in client-service
            so there is a recursive calls to this endpoint.
        -   if the default port not changed it takes 3 minutes and 5-10 sec for the response
            -   also the client-service not able to load the config from the config-server
            -   because of timeout
        
        -   if default port changed it takes very less time
-   :   Solution:
    -   Don't include spring.config.import=optional:configserver:http://localhost:8888/ property
        in git-config-server {application}.properties file, because it will try fetching config server recursive and will end up in a infinite loop