How could I play a shoutcast/icecast stream using HTML5?

2020 update

Modern browsers don’t need any special treatment or server-side workarounds to play audio. Simply use an audio tag with a direct link to one or more stream sources (not a playlist):

<audio>
    <source src="http://relay.publicdomainradio.org/classical.mp3" type="audio/mpeg">
</audio>

From MDN:

The HTML <audio> element is used to embed sound content in documents. It may contain one or more audio sources, represented using the src attribute or the <source> element: the browser will choose the most suitable one.

Browsers support flac, mp3, vorbis, aac, opus and wav. More details on caniuse.com.

Original post

Add a semicolon to the end of the http request. It IS the protocol set forth by shoutcast to override it’s browser detection. Like this:

<audio controls src="http://shoutcast.internet-radio.org.uk:10272/;"></audio>