CodeSampleX

Sample

verify pkg:npm/send@1.2.1

sha256:d3bda259084cb9e39cce04e4cf0243f0aa0c10e2b122a9ab99ea0d1315bee193

Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures. Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments. MIT-0

Execution evidence

Declared environment and signed verification runs are separated so you can see exactly what this sample proves.

Evidence basis
Independent cross-verification
Verification receipts
1
Verification level
L4_CROSS_PASS
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1
2026-08-20

Case

HOW
Goal
verify pkg:npm/send@1.2.1
Packages
Environment
node 22.23.2
Created
2026-08-20T14:19:22Z

Contract

  1. send(req, path, { root }) streams the static file to the HTTP response with correct Content-Type, Content-Length, ETag, Last-Modified, and Accept-Ranges headers
  2. send(req, path, { root }) returns HTTP 304 Not Modified for conditional GET requests when If-None-Match matches the ETag
  3. send(req, path, { root }) returns HTTP 206 Partial Content with Content-Range header for Range byte requests
  4. send(req, path, { root, maxAge }) sets the Cache-Control max-age header accordingly
  5. send(req, path, { root }).on('headers', fn) invokes headers listener allowing custom response headers before streaming
  6. send(req, path, { root }) emits an error with status 404 when the requested file does not exist
  7. send(req, path, { root, dotfiles: 'deny' }) emits an error with status 403 when accessing dotfiles with deny option

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.js

Download the source artifact (tar.gz)

Origin Seeder

anonymous