CORS request with Electron

I can't manage to make a CORS request from my electron app.I have set the required webSecurity

mainWindow = new BrowserWindow({    width: 1024,     height: 768,    show: false,    webPreferences: { webSecurity: false }  });

then trying to get data from zoho servers

fetch('https://books.zoho.com/api/v3/contacts\\?organization_id\\=12345',            {                method: 'get',                headers: {'Authorization': "Zoho-authtoken 984fe68e7f564c6bs01ee9ffb1dsa140",'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8'                }            })            .then(_result =>{                console.info("_result",_result);            })

Headers I'm sending (from network tab), response is 400

GET /api/v3/contacts/?organization_id\=12345 HTTP/1.1Host: books.zoho.comConnection: keep-alivePragma: no-cacheCache-Control: no-cacheauthorization: Zoho-authtoken 987984fe68e7f564c6bs01ee9ffb1dsa140X-DevTools-Request-Id: 21105.4User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) basic-electron-react-boilerplate/0.7.0 Chrome/59.0.3071.115 Electron/1.8.8 Safari/537.36content-type: application/x-www-form-urlencoded;charset=UTF-8Accept: */*Referer: http://localhost:8080/index.htmlAccept-Encoding: gzip, deflateAccept-Language: en-GB

this request works when I curl

curl https://books.zoho.com/api/v3/contacts\?organization_id\=12345 -H 'Authorization: Zoho-authtoken 984fe68e7f564c6bs01ee9ffb1dsa140' -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8"