Porta de Rede

Outcome: Complete the task with Porta de Rede (Network Port). User context: Um frontend usa a porta 4321 e chama uma API na 8000. O proxy público expõe apenas HTTPS na 443. Technical concept or control: Porta de Rede (Network Port). Why it fits: Defina portas claramente para serviços locais, contêineres, firewalls, verificações de integridade e proxies reversos. Do not use it when: Não exponha portas de banco de dados ou administrativas publicamente. Separe portas de contêiner de portas publicadas no host. Engineering requirements: Define inputs, outputs, contracts, and rules that must always hold. Set authorization and input checks. Define failures, timeouts, retries, one-time effects, data moves, and compatibility limits. Operations: Add useful signals and logs that hide sensitive data. Set capacity limits and write an operator guide. Test recovery and rollback. Acceptance criteria: Contract and failure-path tests pass. Data and authorization rules still hold during retries and partial failures. Check performance limits, monitoring, recovery, and rollback. Evidence and limits (evidence boundary): O padrão cobre apenas o escopo listado. Ele não escolhe o estilo visual, decisão do produto ou exemplo de Vibulary. Unknowns to confirm: Where the code runs, data stores, traffic shape, consistency needs, and the security boundary. Also confirm the compatibility period, service goals, and rollback limits.