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41 lines
1.2 KiB
41 lines
1.2 KiB
4 years ago
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// browser shim for xmlhttprequest module
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const hasCORS = require("has-cors");
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const globalThis = require("./globalThis");
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module.exports = function(opts) {
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const xdomain = opts.xdomain;
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// scheme must be same when usign XDomainRequest
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// http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
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const xscheme = opts.xscheme;
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// XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
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// https://github.com/Automattic/engine.io-client/pull/217
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const enablesXDR = opts.enablesXDR;
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// XMLHttpRequest can be disabled on IE
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try {
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if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
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return new XMLHttpRequest();
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}
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} catch (e) {}
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// Use XDomainRequest for IE8 if enablesXDR is true
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// because loading bar keeps flashing when using jsonp-polling
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// https://github.com/yujiosaka/socke.io-ie8-loading-example
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try {
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if ("undefined" !== typeof XDomainRequest && !xscheme && enablesXDR) {
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return new XDomainRequest();
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}
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} catch (e) {}
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if (!xdomain) {
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try {
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return new globalThis[["Active"].concat("Object").join("X")](
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"Microsoft.XMLHTTP"
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);
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} catch (e) {}
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}
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};
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