Sample
rack 3.2.7: Fix Rack 3 rejecting response headers after an upgrade, when the app works fine on its own
Verified sample for gem rack 3.2.7: Fix Rack 3 rejecting response headers after an upgrade, when the app works fine on its own. The contract ran on ruby 3 …
sha256:38abb501510fb17bfdb930c07ec29721747faa1966dbcfabff85019f9c5bcf1d
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.
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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
ruby 3 linux x64 ruby 3 ruby bundler
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| ruby 3 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · gem@1 |
2026-08-14 |
| ruby 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · gem@1 |
2026-08-17 |
Case
MIGRATION- Goal
- Fix Rack 3 rejecting response headers after an upgrade, when the app works fine on its own
- Packages
- Symbols
-
- Rack::Lint
- Rack::Response
- Rack::Headers
- Environment
- ruby 3
- Created
- 2026-08-14T06:09:27Z
Contract
- assert an app returning an uppercase header name still returns 200 on its own
- assert Rack::Lint raises LintError on the uppercase name
- assert Rack::Response stores the key lowercase whatever case was written
- assert Rack::Utils::HeaderHash no longer exists
Files
- Gemfile
- Gemfile.lock
- csx.json
- test/contract.rb