Updating task item from javascript Rest API SharePoint // Working code

// ---------------Updating task item from javascript Rest API SharePoint // Working code

//--------Check for  SP.Data.WorkflowTasksItem     //item type
// http://win12sp13:40/_api/web/lists/GetByTitle('Workflow%20Tasks')/ListItemEntityTypeFullName

//--------Check for all properties of list metadata------
//http://win12sp13:40/_api/Web/Lists/GetByTitle('Workflow%20Tasks')/getItemById('5')

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>

<script type="text/javascript">
var item = {
    "__metadata": { "type": "SP.Data.WorkflowTasksItem" },
    "WorkflowOutcome" : "Completed",
    "Status" : "Completed",
    "PercentComplete" : 1
   
};

function appTask()
{
 var testUrl = _spPageContextInfo.webAbsoluteUrl+"/_api/Web/Lists/GetByTitle('Workflow%20Tasks')/getItemById(7)";

alert(testUrl);
$.ajax({
    url: testUrl,
    type: "PATCH",
    contentType: "application/json;odata=verbose",
    data: JSON.stringify(item),
     headers: {
            "accept": "application/json;odata=verbose",
            "X-RequestDigest": $("#__REQUESTDIGEST").val(),
            "content-Type": "application/json;odata=verbose",
            "X-Http-Method": "PATCH",
            "If-Match": "*"
        },
    data: JSON.stringify(item),
        success: function (data) {
            console.log(data);
alert('success'+ data);
        },
        error: function (error) {
            alert(JSON.stringify(error));
}
});
}
</script>


<div><input type='button' onclick="Javascript:appTask()"  value='Approve'></div>