Status Codes (server->client)
An extension mechanism with fallback
- Semantics of unknown codes defaults to their class:
- 1xx - to be continued
- 2xx - success
- 3xx - further action required, etc...
New Codes can be introduced but...
- Status code collision can only be avoided if binding happens in real time
- This may require multiple RTTs and HTTP state
- Limited space within predefined classes