code: func (req *Request) RemoveMultipartFormFiles() {
  	if req.multipartForm != nil {
  		// Do not check for error, since these files may be deleted or moved
  		// to new places by user code.
  		req.multipartForm.RemoveAll()
  		req.multipartForm = nil
  	}
  	req.multipartFormBoundary = ""
  }
docs: // RemoveMultipartFormFiles removes multipart/form-data temporary files
  // associated with the request.