Sample
Validate WebSocketServer constructor target exclusivity and assert maxPayload limits emit RangeError and RFC 6455 close code 1009
sha256:6b2047032026e36bababc590eb5c6c84ca0edcdcb4867ff2b1b76abf90a2015d
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- node
- Operating system
- linux
- Architecture
- x64
- Runtime
- node
- Language
- node
- Package manager
- npm
Verification-run environments
- Execution context
- node 22
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17
Case
- Goal
- Validate WebSocketServer constructor target exclusivity and assert maxPayload limits emit RangeError and RFC 6455 close code 1009 HOW
- Packages
-
ws 8.21.3
- Environment
- node
- Created
- 2026-08-17T17:07:49Z
Commonly assumed
A payload exceeding maxPayload is either truncated or rejected with a clean close frame without emitting an uncaught socket error, and WebSocketServer without explicit server options defaults to an ephemeral port.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- WebSocketServer constructor throws TypeError when omitting or combining port, server, and noServer options, and default maxPayload is 104,857,600 bytes (100 MiB).
- Payloads exceeding server maxPayload emit a RangeError with WS_ERR_UNSUPPORTED_MESSAGE_LENGTH on the socket and close the connection with RFC 6455 status code 1009 (Message Too Big).
- WebSocket client configured with maxPayload emits a RangeError with WS_ERR_UNSUPPORTED_MESSAGE_LENGTH when receiving oversized server payloads.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9