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how to upload file NOT using multipart encoding? (maybe use octect or something)

It's quite simple to do this, simply pass the blob/file as the parameter to your call to the send method on your XHR instance, for example:

function uploadFile(blobOrFile) {
    var xhr = new XMLHttpRequest();
    xhr.open("POST", "http://mydomain.com/upload", true);

Note that this will only work in File API browsers, (i.e. not IE9 and older)

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