fetch проблема с передачей файла

 <form enctype="multipart/form-data"><input type="file" id="logo" @change="LogoUpload($event.target.files)"></form>

let form = new FormData(); 
form.append("file",files[0]); 
fetch("http://127.0.0.1",{method:'post',headers:{"Content-type":"multipart/form-data"}, body : form});

------WebKitFormBoundary9wcnRDYkOAFMdLOo 
Content-Disposition: form-data; name="file"; filename="a9J63zXOn8s.jpg" 
Content-Type: image/jpeg 
 
 
------WebKitFormBoundary9wcnRDYkOAFMdLOo--