gistfile1.js

    // version 1: working, but not providing what's being sent
    // we need to have full posts come through so rails can get the info
    xhr.open(this.method, this.action, true);
    xhr.setRequestHeader('Accept', 'text/javascript, text/html, application/xml, text/xml, */*');
    xhr.setRequestHeader('Content-Type', 'multipart/form-data');
    xhr.setRequestHeader('X-Version', '1');
    xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
    xhr.setRequestHeader('X-CSRF-Token', this.token);
    xhr.setRequestHeader("X-File-Name", this.file.name);
    xhr.setRequestHeader("X-File-Size", this.file.size);
    xhr.send(this.file.file);