CallService - simulate service / repo layer error.

CreateUser for create single user based on json body.

EmitError helps to build echo non 2xx error response GET /error/:code.

ErrorHandler is fallback exception handler when controller / handler returning error instead of ctx.JSON / echo.NewHTTPError.

GetUser find user by specific id GET /users/:id.

HealthCheck health check handler.

LongOperation simulates long query / api call.

PanicGuaranteed demonstrates what could go wrong during executing handler.