# Vertex AI API . reasoningEngines . a2a . v1 . tasks

## Instance Methods

Returns the pushNotificationConfigs Resource.

Get request for reasoning engine instance via the A2A get protocol apis.

Send post request for reasoning engine instance via the A2A post protocol apis.

Close httplib2 connections.

Stream get request for reasoning engine instance via the A2A stream get protocol apis.

### Method Details

`a2aGetReasoningEngine(name, a2aEndpoint, historyLength=None, x__xgafv=None)`

    Get request for reasoning engine instance via the A2A get protocol apis.

    Args:
      name: string, Required. The full resource path of the reasoning engine, captured from the URL. Format: `projects/{project}/locations/{location}/reasoningEngines/{reasoning_engine}` (required)
      a2aEndpoint: string, Required. The http endpoint extracted from the URL path. i.e. `v1/tasks/123` (required)
      historyLength: string, Optional. The optional query parameter for the getTask endpoint. Mapped from "?history_length=". This indicates how many turns of history to return. If not set, the default value is 0, which means all the history will be returned.
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        {
      "a_key": "", # Properties of the object.
    }

`cancel(name, a2aEndpoint, body=None, x__xgafv=None)`

    Send post request for reasoning engine instance via the A2A post protocol apis.

    Args:
      name: string, Required. The full resource path of the reasoning engine, captured from the URL. (required)
      a2aEndpoint: string, Required. The a2a endpoint path, captured from the URL. e.g., v1/message:send (required)
      body: object, The request body.
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        {
      "a_key": "", # Properties of the object.
    }

`close()`

    Close httplib2 connections.

`subscribe(name, a2aEndpoint, x__xgafv=None)`

    Stream get request for reasoning engine instance via the A2A stream get protocol apis.

    Args:
      name: string, Required. The full resource path of the reasoning engine, captured from the URL. (required)
      a2aEndpoint: string, Required. The http endpoint extracted from the URL path. i.e. `v1/tasks/123:subscribe`. (required)
      x__xgafv: string, V1 error format.
        Allowed values
          1 - v1 error format
          2 - v2 error format

    Returns:
      An object of the form:

        { # Message that represents an arbitrary HTTP body. It should only be used for payload formats that can't be represented as JSON, such as raw binary or an HTML page. This message can be used both in streaming and non-streaming API methods in the request as well as the response. It can be used as a top-level request field, which is convenient if one wants to extract parameters from either the URL or HTTP template into the request fields and also want access to the raw HTTP body. Example: message GetResourceRequest { // A unique request id. string request_id = 1; // The raw HTTP body is bound to this field. google.api.HttpBody http_body = 2; } service ResourceService { rpc GetResource(GetResourceRequest) returns (google.api.HttpBody); rpc UpdateResource(google.api.HttpBody) returns (google.protobuf.Empty); } Example with streaming methods: service CaldavService { rpc GetCalendar(stream google.api.HttpBody) returns (stream google.api.HttpBody); rpc UpdateCalendar(stream google.api.HttpBody) returns (stream google.api.HttpBody); } Use of this type only changes how the request and response bodies are handled, all other features will continue to work unchanged.
      "contentType": "A String", # The HTTP Content-Type header value specifying the content type of the body.
      "data": "A String", # The HTTP request/response body as raw binary.
      "extensions": [ # Application specific response metadata. Must be set in the first response for streaming APIs.
        {
          "a_key": "", # Properties of the object. Contains field @type with type URL.
        },
      ],
    }