Can I use the HTTP range header to load partial files “on purpose”?

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You are right, the link which you posted in the comment would be probably the best approach. As your question sounded interesting i tried it out. You probably did it also, but here is an snippet (for other, that may come looking)

var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET","data.dat",false);
xmlhttp.setRequestHeader("Range", "bytes=100-200");
xmlhttp.send();
console.info(xmlhttp); //--> returns only the partial content
// Tested on Win7 with chrome 46+

Watch-out: the web-server has to support this Request Header Range, for it to work.

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