How to set Authorization header for transport read?

How to set authorization header for transport read?

This kendo ui combo-box is used for display customers list with filter attribute and added the features for set request header i.e.

           beforeSend: function (xhr) {
                xhr.setRequestHeader('UserType', session().UserType)

The example code are given below

    placeholder: "-- Select --",
    dataTextField: "Value",
    dataValueField: "ID",
    filter: "contains",
    autoBind: false,
    minLength: 1,
    dataSource: {
        transport: {
            read: {
                url: "localhost://3454/API/Company/GetCoustomers/1"
            beforeSend: function (xhr) {
                xhr.setRequestHeader('UserType', session().UserType)
            dataType: "json"



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