A Guide to Application Networking Basics
Application-level network requests involve complex underlying processes before data exchange can occur. A client first performs a DNS lookup to resolve an API endpoint's IP address, often targeting a load balancer, after which the operating system routes the packets. To use secure HTTP (HTTPS), the client and server must complete both a TCP handshake and a TLS handshake to establish the connection. Once secured, the request is forwarded by the load balancer to a healthy application instance, which processes it and returns the response.
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Application-level network requests involve complex underlying processes before data exchange can occur. A client first performs a DNS lookup to resolve an API endpoint's IP address, often targeting a load balancer, after which the operating system routes the packets. To use secure HTTP (HTTPS), the client and server must complete both a TCP handshake and a TLS handshake to establish the connection. Once secured, the request is forwarded by the load balancer to a healthy application instance, which processes it and returns the response.
- An application API call begins with a DNS query to resolve the domain to an IP address, which often points to a load balancer rather than a specific server.
- The client operating system directs packet routing across local networks, ISPs, and intermediate routers to the destination network.
- Traditional HTTPS requires completing both a TCP handshake and a TLS handshake before any HTTP request can be transmitted securely.
- A load balancer receives incoming secure requests, identifies a healthy application instance, and forwards the traffic accordingly.
- Understanding the underlying mechanics of networking is an essential competency for software developers.