AJAX Binary Uploads

To be able to upload binary data via AJAX (i.e. XMLHttpRequest), it is necessary that the browser supports XMLHttpRequest 2. Otherwise, binary data will have to be uploaded in Base 64 encoded format, which has 33% additional overheads.

References:

• http://caniuse.com/xhr2
• http://www.html5rocks.com/en/tutorials/file/xhr2/ (also has example on chunked uploading)
• http://www.sitepoint.com/html5-ajax-file-upload/
• http://www.thecssninja.com/javascript/drag-and-drop-upload