Where web server residing in any Application architecture?

Web server always residing before the Application server. The request flow from client to server shown below

        Client-->Web server --->Application server ---->Data base Server.
1.Client sends the request to the server
2.web server takes the request from the client,if the request has business logic then using load balancing request will goes to the Application server
3.Request will goes to DB server using the connection pool configuration.