Update List Item in Sharepoint using old Sharepoint-API in Postman

Question

I already asked a question here: enter link description here I wanted to retrieve the x-requestdigest from sharepoint to make list-operations just using postman. The provided solution worked great to do some GET-Commands! I get my list data in XML-format.

Now i'm facing a problem when trying to update a list item in postman. What i do: i use the same endpoint like in the get-request to update the listitem, so: https://mytenantname.sharepoint.com/_api/Web/lists/getbytitle('mylist')/items(id) or https://mytenantname.sharepoint.com/_api/Web/lists(guid'my_guid')/items(id)

The body content of my request i took from the following link: how-do-i-update-a-hyperlink-field-using-the-rest-api

    {
    '__metadata': { 'type': 'SP.Data.mylistListItem' },
    'myhyperlinkcolumn': 
            {
                '__metadata': { 'type': 'SP.FieldUrlValue' },
                'Description': 'some_description',
                'Url': 'https://anyurl.com'
            }
    }

I always get a Microsoft.SharePoint.Client.InvalidClientQueryException. The Errormessage always says that the field __metadata does not exist in the functions GetByID or GetByName. Even when i try to update just another normal string-field, i get the same errormessage including the name of the concerning fieldname. I also tried to send my request with the xml i retrieved from the get-command containing the new update values, but this seems not to be the right way.

Does anyone have an idea what i do wrong? None of the solutions i found on StackExchange worked for me, so it may be possible that updates also don't seem to be straight forward when not using the .NET-framework? Thanks for a reply!

Answer 1

Ok i found the solution on how-to-update-sharepoint-list-items

I fixed the problem by adding two more header entries: IF-MATCH = * and X-HTTP-Method = MERGE

Now the updates are working fine!