JAVASCRIPT

ajax add header

$.ajax({
  type: "POST",
  beforeSend: function(request) {
    request.setRequestHeader("Authority", authorizationToken);
  },
  url: "entities",
  data: "json=" + escape(JSON.stringify(createRequestObject)),
  processData: false,
  success: function(msg) {
    $("#results").append("The result =" + StringifyPretty(msg));
  }
});

ajax add custom header

$.ajax({
  type: "POST",
  url: "/SupportHelpText.ashx", // c# web service to get HTML data
  beforeSend: function (xhr) { xhr.setRequestHeader('RequestVerificationToken', $('input[name="__RequestVerificationToken"]').val()) },
  data: { 'CustomerName': 'Test Customer' },
  success: function (data) {
    console.log(data);
  },
  error: function (data) {
    console.log(data);
  }
})