matrix-spec-proposals/api/client-server/versions.yaml

# Copyright 2016 OpenMarket Ltd
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# Licensed under the Apache License, Version 2.0 (the "License");
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swagger: '2.0'
info:
  title: "Matrix Client-Server Versions API"
  version: "1.0.0"
host: localhost:8008
schemes:
  - https
  - http
basePath: /_matrix/client
produces:
  - application/json
paths:
  "/versions":
    get:
      summary: Gets the versions of the specification supported by the server.
      description: |-
        Gets the versions of the specification supported by the server.

        Values will take the form ``rX.Y.Z``.

        Only the latest ``Z`` value will be reported for each supported ``X.Y`` value.
        i.e. if the server implements ``r0.0.0``, ``r0.0.1``, and ``r1.2.0``, it will report ``r0.0.1`` and ``r1.2.0``.

        The server may additionally advertise experimental features it supports
        through ``unstable_features``. These features should be namespaced and
        may optionally include version information within their name if desired.
        Features listed here are not for optionally toggling parts of the Matrix
        specification and should only be used to advertise support for a feature
        which has not yet landed in the spec. For example, a feature currently
        undergoing the proposal process may appear here and eventually be taken
        off this list once the feature lands in the spec and the server deems it
        reasonable to do so. Servers may wish to keep advertising features here
        after they've been released into the spec to give clients a chance to
        upgrade appropriately. Additionally, clients should avoid using unstable
        features in their stable releases.        
      operationId: getVersions
      responses:
        200:
          description: The versions supported by the server.
          examples:
            application/json: {
                "versions": ["r0.0.1"],
                "unstable_features": {
                  "org.example.my_feature": true
                }
              }
          schema:
            type: object
            properties:
              versions:
                type: array
                description: The supported versions.
                items:
                  type: string
                  description: The supported versions
              unstable_features:
                type: object
                description: |-
                  Experimental features the server supports. Features not listed here,
                  or the lack of this property all together, indicate that a feature is
                  not supported.                  
                additionalProperties:
                  type: boolean
                  description: Whether or not the namespaced feature is supported.
            required: ['versions']
      tags:
        - Server administration