HttpErrorResponse {header：HttpHeaders，status：401，statusText：“ Unauthorized”-通过发布请求发送图像

Question

我正在发送带有后期处理请求的文件，并且越来越-“未经授权”        upload.component.html。和upload.component.ts代码-

 <input id="file-input" type="file" (change)="fileChange($event)" accept="image/*" capture="environment" />


httpOptions = {
    headers: new HttpHeaders({
    'Content-Type':  '',
    'Authorization': localStorage.getItem('access_token')
   })
  }

constructor(public http: HttpClient) {}
results:any;
fileChange(event) {
    const fileList: FileList = event.target.files;
    if (fileList) {
        const file = fileList[0];

        const formData = new FormData();
        formData.append('Policy_files', file, file.name);
        this.http.post(SERVER_URL, formData, this.httpOptions).subscribe(
          response => {
            console.log(response)
          } ,  (error) => {
            if(error){
              alert('Server Responded With An Error')
              console.log(error)
            }}
      );

    }
}

更新-HttpErrorResponse {headers：HttpHeaders，状态：401，statusText：“未经授权”