> ## Documentation Index > Fetch the complete documentation index at: https://docs.continuouslabs.ai/llms.txt > Use this file to discover all available pages before exploring further. # Start Web Box > Starts a stopped Web Box from the state its stop saved, and returns at once with status starting. A running, starting or stopping Web Box returns 409 webbox_not_stopped. ## OpenAPI ````yaml /openapi/simulation.yaml post /v1/webbox/{id}/start openapi: 3.1.0 info: description: >- Start API Boxes, Web Boxes, MCP Boxes and Cloud Boxes from Snapshots. Authenticate every request with an API key sent as a Bearer token. title: Continuous API version: v1 servers: - description: Continuous production API. url: https://api.continuouslabs.ai security: [] tags: - description: >- Start API Boxes from API Box Snapshots. Each API Box serves its Snapshot's API at its own endpoint, with its own state, in real time. Stop, start and delete them. name: apibox x-group: API Boxes - description: >- Build API Box Snapshots from an OpenAPI, WSDL or GraphQL document, or use the catalog's. API Boxes start from a ready Snapshot. name: apibox-snapshots x-group: API Box Snapshots - description: >- Start Web Boxes from Web Box Snapshots. Each Web Box serves its Snapshot's web app at a host of its own, with its own state, in real time. Stop, start and delete them. name: webbox x-group: Web Boxes - description: >- Build Web Box Snapshots from a vendor's live web app, or use the catalog's. Web Boxes start from a ready Snapshot. name: webbox-snapshots x-group: Web Box Snapshots - description: >- Start MCP Boxes from MCP Box Snapshots. Each MCP Box serves its Snapshot's tools over MCP in front of an API Box. Stop, start and delete them. name: mcpbox x-group: MCP Boxes - description: >- List, rename and delete the MCP Box Snapshots that Continuous publishes into your workspace. Each holds an MCP server's tools, built against an API Box Snapshot. name: mcpbox-snapshots x-group: MCP Box Snapshots - description: >- Create emulated cloud accounts from Cloud Box Snapshots, start and stop them, and manage their Keys and connections. name: cloudbox x-group: Cloud Boxes - description: >- Save a Cloud Box's state as a Snapshot that new Cloud Boxes start from, and inspect, rename or delete Snapshots. name: cloudbox-snapshots x-group: Cloud Box Snapshots - description: >- Deprecated. Use API Box for APIs and Web Box for web apps. Build Simulators from OpenAPI, WSDL or GraphQL documents, check or cancel a build, clone Simulators into other workspaces, and rename and delete Simulators. name: simulators x-group: Simulators - description: >- Deprecated. Use API Box for APIs and Web Box for web apps. Create Simulations from ready Simulators or Snapshots, then rename, stop, start, and delete them. name: simulations x-group: Simulations - description: >- Deprecated. Use API Box for APIs and Web Box for web apps. Save a running Simulation's state as a Snapshot, create Simulations from it, and rename and delete it. name: simulation-snapshots x-group: Simulation Snapshots - description: >- Store connections to real systems: a base URL, the header that carries the credential, and its value. The API never returns a value. name: credentials x-group: Credentials paths: /v1/webbox/{id}/start: post: tags: - webbox summary: Start Web Box description: >- Starts a stopped Web Box from the state its stop saved, and returns at once with status starting. A running, starting or stopping Web Box returns 409 webbox_not_stopped. operationId: start-webbox parameters: - description: Web Box ID. in: path name: id required: true schema: pattern: ^wbx_[0-9A-HJKMNP-TV-Z]{26}$ type: string responses: '202': content: application/json: schema: $ref: '#/components/schemas/WebBox' description: Accepted '401': $ref: '#/components/responses/Unauthorized' '404': content: application/problem+json: examples: webbox_not_found: $ref: '#/components/examples/webbox_not_found' schema: $ref: '#/components/schemas/Error' description: Not Found '409': content: application/problem+json: examples: webbox_not_stopped: $ref: '#/components/examples/webbox_not_stopped' schema: $ref: '#/components/schemas/Error' description: Conflict '429': content: application/problem+json: examples: box_quota_exceeded: $ref: '#/components/examples/box_quota_exceeded' schema: $ref: '#/components/schemas/Error' description: Too Many Requests '500': $ref: '#/components/responses/InternalServerError' '503': content: application/problem+json: examples: auth_provider_unavailable: $ref: '#/components/examples/auth_provider_unavailable' internal_unavailable: $ref: '#/components/examples/internal_unavailable' schema: $ref: '#/components/schemas/Error' description: Service Unavailable security: - apiKeyAuth: [] components: schemas: WebBox: additionalProperties: false properties: created_at: description: Web Box creation time. format: date-time type: string error: $ref: '#/components/schemas/SimulatorError' description: Why its last run stopped without a stop request, or null. id: description: Web Box ID. pattern: ^wbx_[0-9A-HJKMNP-TV-Z]{26}$ type: string include_sample_data: description: Whether the Web Box started with the Snapshot's sample data. type: boolean metadata: description: Customer JSON metadata, or null. name: description: Web Box name. The ID is its identity, and names need not be unique. maxLength: 128 type: string snapshot_id: description: The Web Box Snapshot it started from. pattern: ^wbs_[0-9A-HJKMNP-TV-Z]{26}$ type: string status: description: >- starting while its runtime boots; running while it serves its app; stopping while it saves its state; stopped when it holds no runtime. A start resumes the saved state. enum: - starting - running - stopping - stopped type: string url: description: URL that opens the Web Box's app, at a host of its own. type: string required: - id - name - snapshot_id - status - url - error - metadata - include_sample_data - created_at type: object Error: additionalProperties: false properties: code: description: Stable machine-readable error code. minLength: 1 type: string detail: description: Safe human-readable error detail. minLength: 1 type: string validation: $ref: '#/components/schemas/SpecificationValidation' description: >- Safe specification diagnostics for a rejected build request, when available. required: - validation - code - detail type: object SimulatorError: additionalProperties: false properties: agent_message: description: >- Plain-text explanation from the build agent when it could not continue, or the problems the check of the build's index found. At most 4096 UTF-8 bytes. maxLength: 4096 type: - string - 'null' code: description: >- Stable Simulator build error code. live_credential_rejected is a build that waited at QA for its rejected live credentials and was not resumed within 7 days. enum: - build_failed - build_canceled - specification_validation_failed - live_credential_rejected type: string detail: description: Safe human-readable error detail. type: string reason: description: >- Bounded failure reason for selecting recovery guidance, or null when unavailable. enum: - canceled - specification_invalid - time_limit - service_unavailable - build_failed - null type: - string - 'null' validation: $ref: '#/components/schemas/SpecificationValidation' description: >- Specification validation details. Address these issues before building again. required: - agent_message - reason - validation - code - detail type: - object - 'null' SpecificationValidation: additionalProperties: false properties: issues: description: Specification validation problems. At most 20 are returned. items: $ref: '#/components/schemas/SpecificationIssue' maxItems: 20 type: array required: - issues type: - object - 'null' SpecificationIssue: additionalProperties: false properties: code: description: Stable validation rule code. type: string kind: description: >- Whether the input is invalid, unsupported, incomplete, exceeds a build limit, or has no specific diagnosis. enum: - invalid - unsupported - incomplete - limit - unknown type: string location: description: Readable endpoint or field affected by this issue. maxLength: 512 type: string message: description: What needs attention at this location. type: string operation: description: >- Affected operation ID or method and path, when available. Empty for document-level issues. maxLength: 243 type: string suggestion: description: How to correct or address the problem. type: string required: - code - operation - location - kind - message - suggestion type: object responses: Unauthorized: content: application/problem+json: examples: auth_invalid: $ref: '#/components/examples/auth_invalid' auth_missing: $ref: '#/components/examples/auth_missing' schema: $ref: '#/components/schemas/Error' description: Unauthorized InternalServerError: content: application/problem+json: examples: internal: $ref: '#/components/examples/internal' schema: $ref: '#/components/schemas/Error' description: Internal Server Error examples: webbox_not_found: value: code: webbox_not_found detail: No Web Box was found with ID "wbx_01J8Z5X4K70000000000000004". validation: null webbox_not_stopped: value: code: webbox_not_stopped detail: >- The Web Box with ID "wbx_01J8Z5X4K70000000000000004" is not stopped. Stop it before you start it. validation: null box_quota_exceeded: value: code: simulation_quota_exceeded detail: >- The workspace runs 5 Simulations, API Boxes, Web Boxes and MCP Boxes, which share a limit of 5. Stop or delete one, then retry. validation: null auth_provider_unavailable: value: code: auth_provider_unavailable detail: >- The authentication provider is unavailable. Retry the request after a short delay. validation: null internal_unavailable: value: code: internal_unavailable detail: >- The service is temporarily unavailable. Retry the request after a short delay. validation: null auth_invalid: value: code: auth_invalid detail: The authentication credential is invalid. validation: null auth_missing: value: code: auth_invalid detail: Authentication credentials are required. validation: null internal: value: code: internal detail: The server encountered an unexpected error. validation: null securitySchemes: apiKeyAuth: bearerFormat: Continuous API key description: >- Use a Continuous API key. Send it in the Authorization header as a Bearer token. scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.