code: func getMultipartFile(params *Params, name string) multipart.File {
  	for _, fileHeader := range params.Files[name] {
  		file, err := fileHeader.Open()
  		if err == nil {
  			return file
  		}
  		binderLog.Warn("getMultipartFile: Failed to open uploaded file", "name", name, "error", err)
  	}
  	return nil
  }
docs: // Helper that returns an upload of the given name, or nil.