Ejemplo

Configure Cascade status codes and predicate matching to control fall-through handling across Shelf handlers

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CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · pub@1 · 2026-08-17

Objetivo: Configure Cascade status codes and predicate matching to control fall-through handling across Shelf handlers HOW
Paquetes: shelf 1.4.2
Entorno: dart
Creado: 2026-08-17T11:53:32Z

A shelf Cascade cascades to subsequent handlers on any 4xx or 5xx client or server error response by default.

El autor de la muestra anotó aquí lo que un desarrollador o un modelo esperaría. El contrato de abajo es lo que realmente se ejecutó.

Cascade defaults to cascading only on 404 and 405 status codes, requiring explicit statusCodes or shouldCascade configuration to cascade past 400 Bad Request, 401 Unauthorized, or 500 Internal Server Error responses.
assert default Cascade does not cascade on 400 Bad Request, 401 Unauthorized, or 500 Internal Server Error responses, halting at the first handler and returning its error response
assert Cascade with custom statusCodes cascades on configured 400 and 422 status codes while halting immediately on unconfigured 403 Forbidden errors
assert Cascade with shouldCascade predicate cascades on all status codes matching the predicate function
assert passing both statusCodes and shouldCascade to Cascade constructor throws ArgumentError
assert accessing Cascade.handler on an empty Cascade without inner handlers throws StateError

dart 3 · linux debian/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · pub@1 · 2026-08-17 · ed25519:d91480838ac982c9