docs: func (c *Glacier) InitiateMultipartUploadRequest(input *InitiateMultipartUploadInput) (req *request.Request, output *InitiateMultipartUploadOutput) {
  	op := &request.Operation{
  		Name:       opInitiateMultipartUpload,
  		HTTPMethod: "POST",
  		HTTPPath:   "/{accountId}/vaults/{vaultName}/multipart-uploads",
  	}
  
  	if input == nil {
  		input = &InitiateMultipartUploadInput{}
  	}
  
  	output = &InitiateMultipartUploadOutput{}
  	req = c.newRequest(op, input, output)
  	return
  }