A porta interna é a porta usada pela aplicação dentro do ambiente de deploy. Ela deve bater com o comando de start (ou com o EXPOSE do Dockerfile).Exemplos:
Sua aplicação deve escutar em 0.0.0.0. Se ela escutar apenas em localhost ou 127.0.0.1, pode iniciar corretamente, mas não receber tráfego externo.Exemplos:
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