html2canvas-proxy SyntaxError

[rainchendan]

Use php proxy or asp proxy, it reports 'syntax error' in line 1. I download the html2canvas-proxy zip, and use the proxy file, never modify the php proxy file,
but it tells me 'syntax error' in line 1 '<?php'.

html2canvas($('#draw-part'), { userCORS: true, proxy: "/html2canvasproxy.php", onrendered: function(canvas) {