Networking & Protocols

A dedicated infrastructure layer for managing, securing, and observing service-to-service communication within a microservices architecture.

The automated process of replacing cryptographic certificates before they expire to maintain secure HTTP connections without downtime.

The standardized HTTP header used by servers to explicitly tell clients exactly how long to wait before attempting a failed request again, preventing thundering herds.

How TCP keepalive probes work at the OS level, why cloud firewalls silently drop idle connections before the default 2-hour timeout, and how to configure tcp_keepalive_time to prevent application deadlocks.

An event-driven architectural pattern where one service sends automated HTTP POST requests to another service the moment an event occurs, replacing continuous polling.

The principles of authenticating entities (users and machines) and authorizing their specific permissions across cloud environments and clusters.

The cryptographic trust framework that enables secure communication over untrusted networks via digital certificates and mathematical proof of identity.

The architectural mechanism for ensuring that retrying a failed network request never results in a duplicated action, such as charging a customer's credit card twice.