A gateway can provide a common entry point for selected requests. Service discovery helps clients locate service instances; the two responsibilities are related but different.
Before you begin
Be comfortable with variables, conditions, loops and basic methods. Use a small local project with a recorded JDK version and keep the input data fictional.
Work through the idea
Write the expected behavior before implementing the exercise. Keep the first version small enough to trace manually, then change one input or requirement. Record both the successful path and an invalid or empty-input case so that the result demonstrates reasoning rather than a copied output.
- Map client-facing routes
- Identify who resolves service locations
- Plan failure and timeout behavior
Practice task
Draw a fictional catalogue and order system with a gateway and two instances of one service.
Check your result
Explain what happens if an instance becomes unavailable and how a request is traced.
A mistake to avoid
Avoid adding a gateway to a small application without a concrete routing or policy need.
Keep a review note
Save the inputs or scenario, your reasoning and the result you checked. Explain one assumption and one case that needs more work. Revise the exercise after feedback and distinguish what you demonstrated from what remains untested.
Official reference for further study
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