How do I...sending a blob

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Javascript

HTML5

i have the following code and wonder if its wishful thinking on my part or if it is actually possible to send a blob in this manner

this.sendAudio = function() {

    var blob = event.clipboardData.items[0].getAsFile(),
    var uri = "http://localhost/TestWebService/UploadService.asmx?op=UploadFile";
    var xhr = new XMLHttpRequest();

    xhr.open("POST", uri, true);
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4 && xhr.status == 200) {
           // Handle response.
           alert(xhr.responseText); // handle response.
        }
    };
    xhr.send(blob);
  }