AsyncAPI channel · LangDB · LangDB Chat Completions Streaming (HTTP + SSE)

/chat/completions

Chat completion SSE stream. The client opens this channel by issuing `POST /chat/completions` with `Content-Type: application/json` and a JSON body containing `stream: true`. The server responds with `Content-Type: text/event-stream` and emits a sequence of `data:` lines, each carrying one JSON-serialized `chat.completion.chunk` object, followed by a final `data: [DONE]` line.

Open source AsyncAPI → All LangDB channels LangDB provider profile
Provider: LangDB AsyncAPI: v2.6.0 Spec: LangDB Chat Completions Streaming (HTTP + SSE) Operations: 1 Messages: 2

Channel address

/chat/completions

Operations

streamChatCompletionChunks
Subscribe to streamed chat completion chunks (SSE).

Messages

ChatCompletionChunk
A single SSE `data:` event carrying one JSON `chat.completion.chunk` object. Many of these are emitted per request, in order.
Content-Type: application/json
StreamDone
The literal `data: [DONE]` line that marks the end of the SSE stream.
Content-Type: text/plain

About AsyncAPI

The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.

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