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HTTP_V1_SPEC.md

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The sqld HTTP API v1 specification ("Hrana over HTTP")

Version 1 of the HTTP API ("Hrana over HTTP") is designed to complement the WebSocket-based Hrana protocol for use cases that don't require stateful database connections and for which the additional network roundtrip required by WebSockets relative to HTTP is not necessary.

This API aims to be of production quality and it is primarily intended to be consumed by client libraries. It does not deprecate or replace the "version 0" of the HTTP API, which is designed to be quick and easy for users who send HTTP requests manually (for example using curl or by directly using an HTTP library).

Overview

This HTTP API uses data structures and semantics from the Hrana protocol; versions of the HTTP API are intended to correspond to versions of the Hrana protocol, so HTTP API v1 corresponds to the hrana1 version of Hrana.

Endpoints in the HTTP API correspond to requests in Hrana. Each request is executed as if a fresh Hrana stream was opened for the request.

All request and response bodies are encoded in JSON, with content type application/json.

Execute a statement

POST /v1/execute

-> {
    "stmt": Stmt,
}

<- {
    "result": StmtResult,
}

The execute endpoint receives a statement and returns the result of executing the statement. The Stmt and StmtResult structures are from the Hrana protocol. The semantics of this endpoint is the same as the execute request in Hrana.

Execute a batch

POST /v1/batch

-> {
    "batch": Batch,
}

<- {
    "result": BatchResult,
}

The batch endpoint receives a batch and returns the result of executing the statement. The Batch and BatchResult structures are from the Hrana protocol. The semantics of this endpoint is the same as the batch request in Hrana.

Errors

Successful responses are indicated by a HTTP status code in range [200, 300). Errors are indicated with HTTP status codes in range [400, 600), and the error responses should have the format of Error from the Hrana protocol. However, the clients should be able to handle error responses that don't correspond to this format; in particular, the server may produce some error responses with the error message as plain text.