> ## Documentation Index
> Fetch the complete documentation index at: https://docs.e6data.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Cancel operation

> cancel operation. POST /api/v1/sessions/{session_id}/operations/{operation_id}/cancel. Request cancellation of this session operation. Repeated calls are safe. Poll operation_statu

ReferenceApplies to: Unified engine deployments

## Related guidance

[Addresses and access](https://docs.e6data.com/transformation/http/access.md) · [Request identity](https://docs.e6data.com/transformation/http/request-identity.md) · [Errors and recovery](https://docs.e6data.com/transformation/http/errors.md) · [Pagination and results](https://docs.e6data.com/transformation/http/results.md)


## OpenAPI

````yaml openapi/transformation.json POST /api/v1/sessions/{session_id}/operations/{operation_id}/cancel
openapi: 3.1.0
info:
  description: >-
    HTTP contracts for the Unified engine. Requests use the connected
    deployment's access model and configured owner. Response examples are
    illustrative; inspect your engine response in your client. SQL-managed
    secrets, credentials, streaming pipelines and maintenance run through
    session operations.
  title: Laminar Unified HTTP API
  version: v1
servers:
  - url: https://engine.example.com
    description: >-
      Example engine origin. Replace it with your deployment URL and any API
      mount prefix.
security: []
paths:
  /api/v1/sessions/{session_id}/operations/{operation_id}/cancel:
    post:
      tags:
        - Sessions and SQL
      summary: cancel operation
      description: >-
        cancel operation. POST
        /api/v1/sessions/{session_id}/operations/{operation_id}/cancel. Request
        cancellation of this session operation. Repeated calls are safe. Poll
        operation_status until terminal and cleanup_complete.
      operationId: cancel_operation
      parameters:
        - in: path
          name: operation_id
          required: true
          schema:
            format: uuid
            type: string
        - in: path
          name: session_id
          required: true
          schema:
            format: uuid
            type: string
      responses:
        '202':
          content:
            application/json:
              schema:
                properties: {}
                type: object
          description: Accepted. Follow the returned identity to inspect completion.
        default:
          content:
            application/json:
              example:
                error:
                  code: invalid_request
                  message: Check the request fields
              schema:
                $ref: '#/components/schemas/ApiError'
          description: A rejected or failed request. Inspect error.code before retrying.
components:
  schemas:
    ApiError:
      properties:
        error:
          properties:
            code:
              type: string
            message:
              type: string
          required:
            - code
            - message
          type: object
      required:
        - error
      type: object

````

This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.