The WebSocket URL is only the entrance
A WebSocket starts with an HTTP opening handshake, then becomes a two-way message channel. The standard defines text, binary and control frames. The application defines what its messages mean. A socket that connects successfully is useless until the client can authenticate, subscribe, send commands, parse events and recover after a disconnect.
We trace the code that builds the URL and handshake headers. Then we follow each text or binary message into its parser. The payload may be JSON, protobuf, MessagePack or a custom format. Some apps put several logical channels inside one connection and tag messages with a type, request ID or topic.
Build the application message map
We record outbound messages beside the action that caused them and inbound messages beside the code that consumes them. This reveals message types, required fields, acknowledgements and state changes. Correlation IDs join a response to its request. Sequence numbers and resume tokens show how the app handles missed events.
- Recover the URL, headers, cookies, origin and selected subprotocol.
- Map login, subscribe, unsubscribe, command and acknowledgement messages.
- Decode text and binary payload schemas.
- Reproduce ping, pong, idle timeout and keepalive behavior.
- Handle reconnect, backoff, resubscription and event ordering.
Signing may happen inside each message
Handshake authentication may only open the socket. The app can sign each later message with a timestamp, nonce, sequence value or body hash. We trace those values at the message builder and reproduce the exact serialized bytes before signing. Encryption and compression are handled in the same order used by the APK.
RFC 6455 allows one message to span several frames. The delivered client works at the complete-message layer while the WebSocket library handles frame masking and reassembly. Application-level chunks, envelopes and acknowledgements remain part of the recovered API.
The full delivery
You receive a callable API for the full APK in Python and JavaScript/TypeScript, plus a Postman collection. The clients cover every recovered endpoint and workflow. They create fresh signatures, encrypt requests, decrypt responses, keep authentication and session state, and follow the same request order as the app.
Each client includes clear input models, parsed outputs, refresh behavior, uploads, downloads, streaming events and useful errors where the app uses them. We test the delivery against the live service so it runs without copied requests or old tokens.
Reviewed 30 August 2026 · SReverse research desk