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There are 2 answers to this question. Use the Items API. If we use this then, everything works fine. It’s a type GET request which means, we can only request data through OData operand. No CAML support. https://piyushksingh.com/2017/08/31/retrieve-lookup-managed-metadata-and-person-or-group-data-sharepoint/
The sample below updates the Editor and Author fields on SharePoint on-premises (SP2016 and SP2019) without increasing item version. The REST API ValidateUpdateListItem () on the ListItem object is much easier in providing the Person field values to update.
How to set editor and author in SharePoint?
Both Editor and Author are People and Group (Person) field. According above blogs, you can set the Person field, like: This works fine with SharePoint Online users. However, it does not work with SharePoint on-premises users, although no error returned from the method.
How to update editor and author fields in listitem?
My issue was to update Editor and Author fields for a listitem on SharePoint on-premises (SP2016 and SP 2019) without increasing item version. Both Editor and Author are People and Group (Person) field. According above blogs, you can set the Person field, like:
To access SharePoint resources using REST, construct a RESTful HTTP request by using the OData standard, which corresponds to the desired client object model API.
Are there more errors on the REST API?
Before July 17 2019 we got 429 errors here and there, but their ratio was not significant and allowed our production servers to work as expected. Starting July 17 2019, we see 10 times more 429 exceptions on our Sharepoint Online REST API calls, which makes our production to slow down operations 10 times.
How to access 3rd party REST API in SharePoint?
When trying to access 3rd party REST API (EasyVista) from SharePoint web page, it shows No ‘Access-Control-Allow-Origin’ header is present on the requested resource. I’ve tried passing username and password in jQuery headers, I checked the access-that wasn’t the issue.