Send blob to web service

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Javascript

service

web

HTML5

i have a blob which is currently in my browser temp file, and i would like to send it to a web service. i tried the following code with no luck.

var xhr = new XMLHttpRequest();
    fd = new FormData(document.getElementById("save"));
    fd.append('file', $('#file')[0].files[0]);
    xhr.open("POST", "http://localhost/TestWebService/", true);
    xhr.onreadystatechange = handler;

    xhr.send(fd);