Sample
express 5.1.0: Enable express trust proxy to resolve client IP, HTTPS protocol, and forwarded host behind reverse proxies without silently ignoring X-Forwarded headers
Verified sample for npm express 5.1.0: Enable express trust proxy to resolve client IP, HTTPS protocol, and forwarded host behind reverse proxies without…
sha256:91407f3e83bfceb9b5d36d67130853425cc7c6e45d5ac8532a6043cae432b0a7
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
node linux x64 node node npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-16 |
| 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 |
Case
HOW- Goal
- Enable express trust proxy to resolve client IP, HTTPS protocol, and forwarded host behind reverse proxies without silently ignoring X-Forwarded headers
- Packages
- Symbols
-
- express
- app.set
- req.ip
- req.ips
- req.protocol
- req.secure
- req.hostname
- Environment
- node
- Created
- 2026-08-16T06:30:14Z
Contract
- start express app without trust proxy and verify req.ip ignores X-Forwarded-For
- start express app with trust proxy loopback and verify req.ip extracts client IP
- verify req.ips contains upstream client IP chain
- verify req.protocol evaluates to https from X-Forwarded-Proto
- verify req.secure evaluates to true when proxied over https
- verify req.hostname extracts domain from X-Forwarded-Host
- start express app with subnet trust proxy and verify multi-hop X-Forwarded-For chain extraction
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/app.mjs
- test/contract.mjs