Output Text HTTP

How it fits

Typical backends

Caveats

• Hard constraintEvery entry in transports must be websocket, sse, or http; any other value aborts startup, and an empty list emits nothing and binds no port.
• I/O contractThe wire payload is the string value verbatim with no JSON quoting and no envelope; a list input is fanned out element by element in order, and an empty list delivers nothing.
• I/O contractWith both websocket and sse active, a GET carrying an Upgrade websocket header opens the WebSocket and any other GET opens the SSE stream on the same path.
• FallbackListing http with an empty url silently skips the POST; otherwise HTTP delivery is asynchronous with exponential backoff from initial_retry_delay_ms to max_retry_delay_ms, retried up to max_retries times, dropping the oldest queued request once pending requests exceed queue_capacity.
• Parameter interactionA non-empty sse_event_name is emitted as the SSE event line, so EventSource clients must use addEventListener rather than onmessage.
• State lifetimeOnly url and sse_event_name are hot-swappable at runtime; every other key is captured once at startup.