Sample
sinatra 4.2.1: Prove Sinatra content negotiation with provides quality ranking and automatic Content-Type assignment alongside attachment, cache control, and ETag conditional request evaluation
Verified sample for gem sinatra 4.2.1: Prove Sinatra content negotiation with provides quality ranking and automatic Content-Type assignment alongside…
sha256:22fb9ccb7f2ce387e2601d23d67c1cf392766258ed0a2edb8c21133802955b06
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
ruby linux x64 ruby ruby bundle
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| ruby 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-17 |
| ruby 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-18 |
Case
HOW- Goal
- Prove Sinatra content negotiation with provides quality ranking and automatic Content-Type assignment alongside attachment, cache control, and ETag conditional request evaluation
- Packages
- Symbols
-
- Sinatra::Base
- Sinatra::Base#provides
- Sinatra::Base#content_type
- Sinatra::Base#attachment
- Sinatra::Base#cache_control
- Sinatra::Base#expires
- Sinatra::Base#etag
- Sinatra::Base#last_modified
- Sinatra::Base.mime_type
- Environment
- ruby
- Created
- 2026-08-17T12:17:20Z
Contract
- Sinatra negotiates Accept header quality values within a provides route to assign the matching Content-Type and cascades to 404 on unaccepted types while evaluating separate routes in strict declaration order.
- assert provides with multiple formats selects the format with the highest client Accept quality factor and sets Content-Type
- assert provides defaults to the first format in the list when the client Accept header is absent or wildcard */*
- assert provides rejects unmatched Accept headers with 404 and X-Cascade: pass
- assert separate routes sharing a path evaluate in top-down declaration order rather than by client quality factor preference
- assert custom MIME types registered via mime_type integrate with provides and content_type
- assert content_type appends charset=utf-8 to text MIME types while leaving binary types without charset parameters
- assert attachment sets Content-Disposition and infers Content-Type from filename
- assert cache_control and expires format Cache-Control directives and HTTP-date Expires headers
- assert etag halts with 304 on matching GET If-None-Match, supports weak tags, and enforces 412 Precondition Failed on mutating requests
- assert last_modified halts with 304 on equal or newer If-Modified-Since timestamps
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- src/app.rb
- test/contract.rb