enter image description hereXMLHttpRequest cannot load https://login.salesforce.com/services/Soap/u/33.0. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access

$( document ).ready(function() {

        var param = '<?xml version="1.0" encoding="utf-8" ?><env:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"><env:Body><n1:login xmlns:n1="urn:partner.soap.sforce.com"><n1:username>{username}</n1:username><n1:password>{password}{access_token}</n1:password></n1:login></env:Body></env:Envelope>';

            url: 'https://login.salesforce.com/services/Soap/u/33.0',
            type: 'POST',
            data: param,
            dataType: "xml",
            contentType: "application/x-www-form-urlencoded",
            crossDomain : true,
            beforeSend: function(xhr) {
                xhr.setRequestHeader('SOAPAction', 'login'),
                xhr.setRequestHeader('Content-Type', 'text/xml; application/x-www-form-urlencoded;charset=UTF-8'),
                xhr.setRequestHeader('Content-Description', 'SOAP')
            success: function (data) {
            error: function (xhr, ajaxOptions, thrownError) {


I think you are missing few steps before calling REST API

  1. You will need to setup and pass oAuth 2.0 properly. https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/intro_understanding_user_agent_oauth_flow.htm
  2. You will need to setup whitelist address in CORS https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/extend_code_cors.htm
| improve this answer | |
  • 1
    1. Yes. I want to get access token using username , password & access token only.There is a way to get access token using SOAP API.I need that way.If I put these details into Chrome Postman Plugin It works well.What i wanted to do is i need to pass ajax request and get access token. 2. How i enable all cors (*) in Salesforce ? – Kavinda Wickramasingha May 29 '17 at 7:02

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