Update SharePoint List items without using the '__metadata' property (ListItemEntityTypeFullName)

UpdateListItemNometadata.js

$(function() {
    'use strict';

    var requestHeaders = {
        'X-RequestDigest': $("#__REQUESTDIGEST").val(),
        "accept": "application/json;odata=nometadata",
        "content-type": "application/json;odata=nometadata",
        "IF-MATCH": "*",
        "X-HTTP-Method":"MERGE"
    };

    var listItemData = {
        'Title': "Updated without using '__metadata' property",
    }

    $.ajax({
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/lists/GetByTitle('MyCustomList')/items(1)",
        type: "POST",
        headers: requestHeaders,
        data: JSON.stringify(listItemData),
        success: function (data) {
            console.log(data)
        },
        error: function (jqxr, errorCode, errorThrown) {
            console.log(jqxr.responseText);
        }
    });
});