How To Fetch Data From Task List Using Rest For Workflow History In SharePoint Online

I got a requirement to make a history form for a workflow. For that, I had to fetch the data from a task list. We can use Rest API, SP Services, or any other methods for this kind of task. So, I chose REST API for the same. Now, the question is, what will be the scenario? Because Workflow status columns of Assign to and Modified Date are not available in the normal list. Then, I learned that we can fetch it from the task list or history list as in workflow all the information resides in Task list & History List.

source http://www.c-sharpcorner.com/article/how-to-fetch-data-from-task-list-using-rest-for-workflow-history-in-sharepoint-o/