Why does this remote script cause IE6 to hang?

StackOverflow https://stackoverflow.com/questions/185149

Question

Please take a look at the html listed below and let me know why IE6 freezes when trying to load the remote script (located at 'http://code.katzenbach.com/Default.aspx'). The script returns JSONP and executes the 'callbackFunction' listed in the header. When it runs correctly, you'll see a pop-up alert showing numbers 1-500. This works fine in FF3 and IE7. I can't understand why it fails in Internet Explorer 6 -the processor gets pegged and everything hangs.

Run it yourself and let me know if you experience the same problem. I've been staring at this problem all day. Thanks for your help.

Andrew

<html>
<head>
    <script type="text/javascript">
    function callbackFunction(Result)
    {
        alert(Result) ;
    }
    </script>
    <script type="text/javascript" src="http://code.katzenbach.com/Default.aspx?callback=callbackFunction&test=true&c=500"></script>
</head>
<body>
Here
</body>
</html>
Was it helpful?

Solution

If you go directly to the script (http://code.katzenbach.com/Default.aspx?callback=callbackFunction&test=true&c=500), you'll see the file (unknown mime type) is not being processed. This is likely due to a problem with your server setup. It doesn't seem to know how to process .aspx and in instead trying to stream out the file.

OTHER TIPS

I took a look with Fiddler and IE6 and was unable to see anything out of the ordinary (besides the fact that it freezes the browser).

The request to http://code.katzenbach.com/Default.aspx?callback=callbackFunction&test=true&c=500 does get made and returns 2909 bytes.

I'd suggest three things:

  1. Remove one of the semi-colons from your Content-Type: application/json;; charset=utf-8 or maybe remove both semi-colons and charset=utf-8 entirely (just to test)
  2. Send a newline character after you're done sending the final ) of callbackFunction
  3. Change it to Content-Type: text/javascript because you really are returning Javascript to the browser, and the other content type might be confusing IE6 (although it is very unlikely).

I'm thinking 1. is most likely. There may be a parsing bug in IE6 that causes it to go into an endless loop when it encounters two semi-colons. Because otherwise there simply isn't any reason why what you are doing should not work.

It also might be worthwhile to try a different MIME type as a test.

The return is of the external script is:

callbackFunction(["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39","40","41","42","43","44","45","46","47","48","49","50","51","52","53","54","55","56","57","58","59","60","61","62","63","64","65","66","67","68","69","70","71","72","73","74","75","76","77","78","79","80","81","82","83","84","85","86","87","88","89","90","91","92","93","94","95","96","97","98","99","100","101","102","103","104","105","106","107","108","109","110","111","112","113","114","115","116","117","118","119","120","121","122","123","124","125","126","127","128","129","130","131","132","133","134","135","136","137","138","139","140","141","142","143","144","145","146","147","148","149","150","151","152","153","154","155","156","157","158","159","160","161","162","163","164","165","166","167","168","169","170","171","172","173","174","175","176","177","178","179","180","181","182","183","184","185","186","187","188","189","190","191","192","193","194","195","196","197","198","199","200","201","202","203","204","205","206","207","208","209","210","211","212","213","214","215","216","217","218","219","220","221","222","223","224","225","226","227","228","229","230","231","232","233","234","235","236","237","238","239","240","241","242","243","244","245","246","247","248","249","250","251","252","253","254","255","256","257","258","259","260","261","262","263","264","265","266","267","268","269","270","271","272","273","274","275","276","277","278","279","280","281","282","283","284","285","286","287","288","289","290","291","292","293","294","295","296","297","298","299","300","301","302","303","304","305","306","307","308","309","310","311","312","313","314","315","316","317","318","319","320","321","322","323","324","325","326","327","328","329","330","331","332","333","334","335","336","337","338","339","340","341","342","343","344","345","346","347","348","349","350","351","352","353","354","355","356","357","358","359","360","361","362","363","364","365","366","367","368","369","370","371","372","373","374","375","376","377","378","379","380","381","382","383","384","385","386","387","388","389","390","391","392","393","394","395","396","397","398","399","400","401","402","403","404","405","406","407","408","409","410","411","412","413","414","415","416","417","418","419","420","421","422","423","424","425","426","427","428","429","430","431","432","433","434","435","436","437","438","439","440","441","442","443","444","445","446","447","448","449","450","451","452","453","454","455","456","457","458","459","460","461","462","463","464","465","466","467","468","469","470","471","472","473","474","475","476","477","478","479","480","481","482","483","484","485","486","487","488","489","490","491","492","493","494","495","496","497","498","499"])

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