aaac7fed
 liuqimichale
add
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'use strict';
var inherits = require('inherits')
, AjaxBasedTransport = require('./lib/ajax-based')
, XhrReceiver = require('./receiver/xhr')
, XHRCorsObject = require('./sender/xhr-cors')
, XHRLocalObject = require('./sender/xhr-local')
, browser = require('../utils/browser')
;
function XhrStreamingTransport(transUrl) {
if (!XHRLocalObject.enabled && !XHRCorsObject.enabled) {
throw new Error('Transport created when disabled');
}
AjaxBasedTransport.call(this, transUrl, '/xhr_streaming', XhrReceiver, XHRCorsObject);
}
inherits(XhrStreamingTransport, AjaxBasedTransport);
XhrStreamingTransport.enabled = function(info) {
if (info.nullOrigin) {
return false;
}
// Opera doesn't support xhr-streaming #60
// But it might be able to #92
if (browser.isOpera()) {
return false;
}
return XHRCorsObject.enabled;
};
XhrStreamingTransport.transportName = 'xhr-streaming';
XhrStreamingTransport.roundTrips = 2; // preflight, ajax
// Safari gets confused when a streaming ajax request is started
// before onload. This causes the load indicator to spin indefinetely.
// Only require body when used in a browser
XhrStreamingTransport.needBody = !!global.document;
module.exports = XhrStreamingTransport;
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