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Of CORS We Do

API
JavaScript

August 27th, 2010 by Thor

If you’re a JavaScript head, we’ve got something for you. SoundCloud now supports Cross Origin Resource Sharing, using XMLHttpRequest. Or, to put it another way: no more implausible JSON-P hacks.

Some background on CORS can be found here and here. Our implementation is super-simple: we let you do GET requests, for our public resources. Full documentation of the feature is on our wiki, but here’s a bit of code to get you started:

var invocation = new XMLHttpRequest();
// Internet Explorer uses a propritary object called XDomainRequest
var url = 'https://api.soundcloud.com/tracks';
function callOtherDomain() {
    if (invocation) {
        invocation.open('GET', url, true);
        invocation.onreadystatechange = handler;
        invocation.send();
    }
}

As we’re just setting headers, the implementation was done as an…