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