PrimeNg6.0版本upload控件设置文件头

在6.0版本的PrimeNG的upload控件中上传使用的是http而非HTTPClient，因此在angular的Interceptor中拦截不到。
可在onBeforeSend事件中对请求头进行修改

<p-fileUpload name="fileName" [url]="uploadDailyDataUrl" chooseLabel="选择文件" uploadLabel="上传文件" cancelLabel="取消上传"
      method="post" (onUpload)="onUpload($event)" multiple="multiple" (onBeforeSend)="onBeforeSend($event)">
    </p-fileUpload>

  onBeforeSend(event) {
    this.xhr = event.xhr;
    this.xhr.setRequestHeader("Authorization", localStorage.getItem("sessionId"));
  }