Ways to reach Microservice from public network

1. API Gateway

        @startuml
        participant User as u
        participant Browser as b
        participant CDN as cdn
        box "AWS" #LightPink
        participant API_Gateway as api
        participant lambda_AppServer as l
        end box
        
        
        u -> b: GET http://RESTApi:port/v1/users
        b -> cdn: Give IP of API G/W
        cdn -> b: IP of API G/W
        note over b 
        - call javascript code
        - js code will 
        call AJAX library
        - AJAX is jquery 
        framework for
        making HTTP calls
        end note
        
        b -> api: HTTP GET
        api -> l: GET http://RESTApi:port/v1/users
        l -> api: json
        api -> b: json 
        note over b
        users {
         a,
         b
        }
        end note
        @enduml
      

2. External Load Balancer

        @startuml
        !pragma teoz true
        participant User as u
        participant Browser as b
        box "AWS" #LightPink
        participant External_LoadBalancer as elb
        participant "Internal_LoadBalancer\nAmbassador" as ilb
        
        box "POD" #LightGreen
        participant "Container-1\nsidecar" as sidecar
        participant "Container-2\napp-server" as app
        end box
        participant Database as db
        end box
        
        u -> b: GET https://RESTApi:port/v1/users
        note over b 
        - call javascript code
        - js code will 
        call AJAX library
        - AJAX is jquery 
        framework for
        making HTTP calls
        end note
        
        b -> elb: HTTP GET
        elb-> ilb: GET https://RESTApi:port/v1/users
        ilb-> sidecar: GET https://RESTApi:port/v1/users
        sidecar-> app: Removes https
        app -> db: GET users
        db -> app: users
        note over app
        users {
         a,
         b
        }
        end note
        app -> sidecar: Users JSON
        sidecar -> ilb: https {Users Json}
        ilb -> elb:  https {Users Json}
        elb -> b:  https {Users Json}
        b -> u: List of users
        @enduml