示例
express 4.21.2: Handle Express res.format content negotiation 406 error dispatch, canonicalized err.types, unconditional Vary header, and default fallback semantics
已验证示例 — npm express 4.21.2: Handle Express res.format content negotiation 406 error dispatch, canonicalized err.types, unconditional Vary header, and default…
sha256:2fa6c10475b5b6d8e09997cd54b5033b0d036a8e8a20dff8820063ebce125ae2
本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。
提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。
MIT-0
执行证据
声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。
- 证据依据
- 签名契约通过
- 验证回执
- 2
- 构建过它的签名密钥
- 2
声明的环境
node linux x64 node node npm
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-17 |
| node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-18 |
案例
HOW- 目标
- Handle Express res.format content negotiation 406 error dispatch, canonicalized err.types, unconditional Vary header, and default fallback semantics
- 符号
-
- res.format
- 环境
- node
- 创建时间
- 2026-08-17T06:38:16Z
契约
- res.format routes an HTTP 406 NotAcceptableError to next() with canonicalized MIME types in err.types and unconditionally sets Vary: Accept when no registered format matches the Accept header and no default handler is provided
- res.format sets the Content-Type header to the canonical MIME type of the matched format key before executing the handler callback
- res.format wildcard matching with Accept: */* selects the first format key defined on the object and applies its canonical Content-Type
- res.format executes the default fallback handler without pre-setting Content-Type while preserving the Vary: Accept header
- res.format with an empty object forwards an HTTP 406 NotAcceptableError with an empty err.types array to next()
文件
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs