> ## Documentation Index > Fetch the complete documentation index at: https://docs.eorion.com/llms.txt > Use this file to discover all available pages before exploring further. # 根据Id获取 > Retrieves a historic activity instance by id, according to the `HistoricActivityInstance` interface in the engine. ## OpenAPI ````yaml GET /history/activity-instance/{id} openapi: 3.0.2 info: title: ORION Platform REST API description: OpenApi Spec for ORION Camunda Platform REST API. version: 7.22.6-ee license: name: Apache License 2.0 url: http://www.apache.org/licenses/LICENSE-2.0.html servers: - url: http://{host}:{port}/{contextPath} description: The API server for the default process engine variables: host: default: localhost port: default: '8080' contextPath: default: engine-rest - url: http://{host}:{port}/{contextPath}/engine/{engineName} description: The API server for a named process engine variables: host: default: localhost port: default: '8080' contextPath: default: engine-rest engineName: default: default - url: '{url}' description: The API server with a custom url variables: url: default: '' security: - basicAuth: [] tags: - name: Authorization - name: Batch - name: Condition - name: Decision Definition - name: Decision Requirements Definition - name: Deployment - name: Engine - name: Event Subscription - name: Execution - name: External Task - name: Filter - name: Group - name: Historic Activity Instance - name: Historic Batch - name: Historic Decision Definition - name: Historic Decision Instance - name: Historic Decision Requirements Definition - name: Historic Detail - name: Historic External Task Log - name: Historic Identity Link Log - name: Historic Incident - name: Historic Job Log - name: Historic Process Definition - name: Historic Process Instance - name: Historic Task Instance - name: Historic User Operation Log - name: Historic Variable Instance - name: History Cleanup - name: Identity - name: Incident - name: Job - name: Job Definition - name: Message - name: Metrics - name: Migration - name: Modification - name: Process Definition - name: Process Instance - name: Signal - name: Schema Log - name: Task - name: Task Attachment - name: Task Comment - name: Task Identity Link - name: Task Local Variable - name: Task Variable - name: Telemetry - name: Tenant - name: User - name: Variable Instance - name: Version externalDocs: description: Find out more about ORION Rest API url: https://docs.eorion.com paths: /history/activity-instance/{id}: get: tags: - Historic Activity Instance summary: Get description: >- Retrieves a historic activity instance by id, according to the `HistoricActivityInstance` interface in the engine. operationId: getHistoricActivityInstance parameters: - name: id in: path schema: type: string required: true description: The id of the historic activity instance to be retrieved. responses: '200': content: application/json: schema: $ref: '#/components/schemas/HistoricActivityInstanceDto' examples: example-1: summary: GET `/history/activity-instance/aActivityInstId` value: id: aActivityInstId activityId: anActivity activityName: anActivityName activityType: userTask assignee: peter calledProcessInstanceId: aHistoricCalledProcessInstanceId calledCaseInstanceId: null canceled: true completeScope: false durationInMillis: 2000 endTime: 2013-04-23T18:42:43.000+0200 executionId: anExecutionId parentActivityInstanceId: aHistoricParentActivityInstanceId processDefinitionId: aProcDefId processInstanceId: aProcInstId startTime: 2013-04-23T11:20:43.000+0200 taskId: aTaskId tenantId: null removalTime: 2018-02-10T14:33:19.000+0200 rootProcessInstanceId: aRootProcessInstanceId description: Request successful. '404': content: application/json: schema: $ref: '#/components/schemas/ExceptionDto' description: >- Not Found Historic activity instance with given id does not exist. See the [Introduction](https://docs.camunda.org/manual/7.22/reference/rest/overview/#error-handling) for the error response format. components: schemas: HistoricActivityInstanceDto: type: object properties: id: type: string nullable: true description: The id of the activity instance. parentActivityInstanceId: type: string nullable: true description: >- The id of the parent activity instance, for example a sub process instance. activityId: type: string nullable: true description: The id of the activity that this object is an instance of. activityName: type: string nullable: true description: The name of the activity that this object is an instance of. activityType: type: string nullable: true description: The type of the activity that this object is an instance of. processDefinitionKey: type: string nullable: true description: >- The key of the process definition that this activity instance belongs to. processDefinitionId: type: string nullable: true description: >- The id of the process definition that this activity instance belongs to. processInstanceId: type: string nullable: true description: >- The id of the process instance that this activity instance belongs to. executionId: type: string nullable: true description: The id of the execution that executed this activity instance. taskId: type: string nullable: true description: >- The id of the task that is associated to this activity instance. Is only set if the activity is a user task. assignee: type: string nullable: true description: >- The assignee of the task that is associated to this activity instance. Is only set if the activity is a user task. calledProcessInstanceId: type: string nullable: true description: >- The id of the called process instance. Is only set if the activity is a call activity and the called instance a process instance. calledCaseInstanceId: type: string nullable: true description: >- The id of the called case instance. Is only set if the activity is a call activity and the called instance a case instance. startTime: type: string format: date-time nullable: true description: >- The time the instance was started. By [default](https://docs.camunda.org/manual/7.22/reference/rest/overview/date-format/), the date must have the format `yyyy-MM-dd'T'HH:mm:ss.SSSZ`, e.g., `2013-01-23T14:42:45.000+0200`. endTime: type: string format: date-time nullable: true description: >- The time the instance ended. By [default](https://docs.camunda.org/manual/7.22/reference/rest/overview/date-format/), the date must have the format `yyyy-MM-dd'T'HH:mm:ss.SSSZ`, e.g., `2013-01-23T14:42:45.000+0200`. durationInMillis: type: integer format: int64 nullable: true description: The time the instance took to finish (in milliseconds). canceled: type: boolean nullable: true description: If `true`, this activity instance is canceled. completeScope: type: boolean nullable: true description: If `true`, this activity instance did complete a BPMN 2.0 scope. tenantId: type: string nullable: true description: The tenant id of the activity instance. removalTime: type: string format: date-time nullable: true description: >- The time after which the activity instance should be removed by the History Cleanup job. By [default](https://docs.camunda.org/manual/7.22/reference/rest/overview/date-format/), the date must have the format `yyyy-MM-dd'T'HH:mm:ss.SSSZ`, e.g., `2013-01-23T14:42:45.000+0200`. rootProcessInstanceId: type: string nullable: true description: >- The process instance id of the root process instance that initiated the process containing this activity instance. ExceptionDto: title: ExceptionDto type: object properties: type: type: string nullable: true description: An exception class indicating the occurred error. message: type: string nullable: true description: A detailed message of the error. code: type: number description: >- The code allows your client application to identify the error in an automated fashion. You can look up the meaning of all built-in codes and learn how to add custom codes in the [User Guide](https://docs.camunda.org/manual/7.22/user-guide/process-engine/error-handling/#exception-codes). securitySchemes: basicAuth: type: http scheme: basic ````