Unable to open URL in new tab from ajax hit

Ext.Ajax.request({

url: 'generate_birt/',

});

in view.py 

def generate_birt(request):

    url = 'http://10.2.114.2:8080/birt/frameset?__report=report/test.rptdesign&sample=my+parameter&__format=pdf'

    return  HttpResponseRedirect(url,mimetype='pdf')

following error throws  

XMLHttpRequest cannot load http://10.2.114.2:8080/birt/frameset?__report=report/test.rptdesign&sample=my+parameter&__format=pdf. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://10.2.114.2:8000' is therefor

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