REST API Workflow Task not change its state

Question

We are shifting our code from .Net - C# to REST API for Workflow TASK Approval process.

We have successfully change the update item in Workflow Task list, but Workflow not change its status using REST API Code.

$( document).ready(function() {


    $.ajax({
          url: "https://myonlinesite.sharepoint.com/it/_api/web/lists/GetByTitle('Workflow%20Tasks')/items/getById('4609')",
             type: "POST",
    data: JSON.stringify({ '__metadata': { 'type': 'SP.Data.Workflow_x0020_Tasks1ListItem' }, 'Status':'Completed', 'PercentComplete':'100','Nintex_x0020_Task_x0020_Outcomes':'Approved' }),
             headers: { 
                 "X-HTTP-Method":"PATCH",
                 "accept": "application/json;odata=verbose",
                 "content-type": "application/json;odata=verbose",
                 //"content-length": 1000,
                 "X-RequestDigest": $("#__REQUESTDIGEST").val(),
                 "IF-MATCH": "*"
             },
              beforeSend: function (XMLHttpRequest) {                     
                XMLHttpRequest.setRequestHeader("Accept", "application/json; odata=verbose");
                },  
             success: function (data) {
                 // Returning the results
                 console.log('success');
             },
             error: function (data) {
                 console.log(data);
             }
    });
    });

Above script mark item as completed, but unable to reach at second approve level (not changing its state).

Answer 1

through rest you can update the column of workflow but you cannot you update extended property "Task.ModerationInformation.Status" which result to fire the workflow. The above property is only accessible in server object model.

For example

 task.ModerationInformation.Status = SPModerationStatusType.Approved;