WebSocket event flow review

Follow a synthetic WebSocket event through validation, processing and recovery. Check connection loss and repeated messages without contacting a production service.

Overview#

Lab class: Offline trace fixture or loopback protocol simulation

Review map#

• initial HTTPS/WSS URL, DNS and certificate identity;
• browser Origin policy where applicable;
• authentication placement and token exposure;
• subprotocol negotiation;
• maximum frame/message and fragmentation handling;
• JSON/binary schema and version validation;
• tenant/site/resource authorisation;
• ping/pong, idle timeout and lease behaviour;
• buffered amount, server/client queue and overflow;
• reconnect, replay/resume token and gap reconciliation;
• close code and error logging without secret leakage.

Synthetic cases#

Plan a valid event, unsupported schema, extra/missing field, unauthorised site, oversized message, binary message where text is required, duplicate ID, out of order sequence, expired authentication, wrong certificate name, idle timeout, and reconnect without replay support. Map each case against the trace contract or a purpose built loopback state simulator; don't start or contact a WebSocket service endpoint.

Evidence checklist#

• Fixture provenance, protocol version, subprotocol, schema version, and represented trust boundary recorded
• URL, certificate name, Origin, authentication, and token exposure expectations reviewed
• Text/binary, fragmentation, frame/message size, schema, and tenant authorisation cases assessed
• Queue bounds, flow control, ping/pong, idle timeout, close codes, and error redaction documented
• Duplicate, ordering, reconnect, replay/resume, and gap reconciliation behaviour mapped
• Delivery acknowledgement kept distinct from event persistence or physical outcome

Sources#

• RFC 6455 WebSocket, accessed 25 August 2026.

Related pages#

• WebSocket/SSE/webhooks
• TypeScript example

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