Refactor a travel package API so a changed destination model does not break older clients. Use resource-based routes, URI versioning, additive DTO evolution, OpenAPI documents, JWT authorization, and typed HttpClient proxies to run old and new contracts side by side.
Learn how to design a REST API before implementation, generate Go server contracts from OpenAPI, keep HTTP code outside the domain, and evolve public endpoints without breaking clients.
Learn how to run a Go HTTP server with external configuration, safe timeouts, clear routes, observability headers, and graceful shutdown for reliable production deployments.
Learn how to design Java messaging flows with queues, topics, delivery guarantees, dead letter queues, message persistence, copies, and operational tracing.