Beispiel

Show how calling next() twice in Express middleware bypasses intermediate async middlewares to execute subsequent route handlers prematurely.

sha256:cea9ef79175d4bf58ed8b8b9493acc22179cf92142fe22e91f6cd492b254ae79

Fall

Ziel

Show how calling next() twice in Express middleware bypasses intermediate async middlewares to execute subsequent route handlers prematurely. HOW

Pakete

express 4.22.2

Umgebung

node

Erstellt

2026-08-17T01:50:39Z

Häufige Annahme

Express executes middlewares and route handlers in strict sequential order, preventing subsequent routes from running until preceding async middlewares complete and call next().

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• A downstream route handler is executed before a preceding async middleware completes if an earlier middleware calls next() twice.
• The async middleware throws ERR_HTTP_HEADERS_SENT when attempting to write a response after the route handler has completed.

Dateien

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

Verifiziertes Artefakt herunterladen (tar.gz) — genau die Bytes, gegen die der Contract lief

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9