Downloading Binary Streams with Javascript XMLHttpRequest
This precious technique is researched & developed by Marcus Granado
Refer to http://mgran.blogspot.com/2006/08/downloading-binary-streams-with.html
Request binary stream in FF
Comments refer to working in IE
Refer to http://mgran.blogspot.com/2006/08/downloading-binary-streams-with.html
Request binary stream in FF
load_url = function(url) {
netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
var req = new XMLHttpRequest();
req.open('GET',url,false);
//XHR binary charset opt by Marcus Granado 2006 [http://mgran.blogspot.com]
req.overrideMimeType('text/plain; charset=x-user-defined');
req.send(null);
if (req.status != 200) return '';
return req.responseText;
}
Comments refer to working in IE
At 9/14/2006 9:50 AM , Ben said...
This sounds like a great way to fix this problem but unfortunately it doesn't seem to work in IE. I'm trying to preload images using this method but the Microsoft.XMLHTTP implementation of XmlHttpRequest unfortunately doesn't include overrideMimeType. I've tried to use req.setRequestHeader('Accept','text/plain; charset=x-user-defined') but this doesn't work either.
Any help would be greatly appreciated :)
At 9/14/2006 11:00 AM , Marcus Granado said...
Hi, Ben. I developed the technique above to work on Mozilla/Firefox, but I didn't test on IE or any other browser (BTW, IE understands x-user-defined charset). It would be interesting if you could sniff the http headers being sent by IE after using setRequestHeader() as you suggested, to see if the headers are really being modified and compare with the output of FF. You might also want to set the headers 'accept-charset' and 'content-type' to the charset/mimetype above and have a try.
Further, IE seems to be able to natively read binary raw bytes by reading the property 'XHR.responseStream', which FF lacks. Have e.g. a look here, here and
here.
Let me know if any of the above works.
Labels: coding, javascript
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