src_obj1_etag=$(echo "${stat_out1}" | jq '.etag')
src_obj1_size=$(echo "${stat_out1}" | jq '.size')
src_obj1_md5=$(echo "${stat_out1}" | jq '.metadata."X-Amz-Server-Side-Encryption-Customer-Key-Md5"')
echo "Stat minio1/test-bucket/defpartsize"
./mc stat minio1/test-bucket/defpartsize --enc-c "minio1/test-bucket/defpartsize=${TEST_MINIO_ENC_KEY}" --insecure --json

src_obj1_etag=$(echo "${stat_out1}" | jq '.etag')
src_obj1_size=$(echo "${stat_out1}" | jq '.size')
src_obj1_md5=$(echo "${stat_out1}" | jq '.metadata."X-Amz-Server-Side-Encryption-Customer-Key-Md5"')
echo "Stat minio1/test-bucket/defpartsize"
./mc stat minio1/test-bucket/defpartsize --enc-c "minio1/test-bucket/defpartsize=${TEST_MINIO_ENC_KEY}" --insecure --json

Sehen wir uns das alles anhand eines Beispiels an.

Stellen Sie sich vor, Sie entwickeln eine Anwendung, mit der Sie Rechnungen erstellen können.

Diese Rechnungen haben eine `id`, einen optionalen `title`, einen `customer` (Kunde) und ein `total` (Gesamtsumme).

Der Benutzer Ihrer API (ein externer Entwickler) erstellt mit einem POST-Request eine Rechnung in Ihrer API.

Dann wird Ihre API (beispielsweise):

Imagine you develop an app that allows creating invoices.

These invoices will have an `id`, `title` (optional), `customer`, and `total`.

The user of your API (an external developer) will create an invoice in your API with a POST request.

Then your API will (let's imagine):

* Send the invoice to some customer of the external developer.
* Collect the money.
* Send a notification back to the API user (the external developer).

API 应用调用外部 API 时的流程叫做**回调**。因为外部开发者编写的软件发送请求至您的 API，然后您的 API 要进行回调，并把请求发送至外部 API。

此时，我们需要存档外部 API 的*信息*，比如应该有哪些*路径操作*，返回什么样的请求体，应该返回哪种响应等。

## 使用回调的应用

示例如下。

假设要开发一个创建发票的应用。

发票包括 `id`、`title`（可选）、`customer`、`total` 等属性。

API 的用户 （外部开发者）要在您的 API 内使用 POST 请求创建一条发票记录。

（假设）您的 API 将：

* 把发票发送至外部开发者的消费者
* 归集现金
* 把通知发送至 API 的用户（外部开发者）
    * 通过（从您的 API）发送 POST 请求至外部 API （即**回调**）来完成

## 常规 **FastAPI** 应用

		Description:    "Requests specifying Server Side Encryption with Customer provided keys must provide an appropriate secret key.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMissingSSECustomerKeyMD5: {
		Code:           "InvalidArgument",
		Description:    "Requests specifying Server Side Encryption with Customer provided keys must provide the client calculated MD5 of the secret key.",

src_obj4_etag=$(echo "${stat_out4}" | jq '.etag')
src_obj4_size=$(echo "${stat_out4}" | jq '.size')
src_obj4_md5=$(echo "${stat_out4}" | jq '.metadata."X-Amz-Server-Side-Encryption-Customer-Key-Md5"')

# Stat the objects from replicated site
echo "Stat minio2/test-bucket/encrypted"
./mc stat minio2/test-bucket/encrypted --insecure --json

	parts          []ObjectPartInfo
	header         http.Header
	bucket, object string
	metadata       map[string]string

	partDecRelOffset, partEncRelOffset int64

	copySource bool
	// Customer Key
	customerKeyHeader string
}

func (d *DecryptBlocksReader) buildDecrypter(partID int) error {
	m := cloneMSS(d.metadata)
	// Initialize the first decrypter; new decrypters will be

// the handler should ensure to remove these keys before sending them to the object layer.
// Currently these keys are:
//   - X-Amz-Server-Side-Encryption-Customer-Key
//   - X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key
func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "CopyObject")

    (including a physical distribution medium), accompanied by a
    written offer, valid for at least three years and valid for as
    long as you offer spare parts or customer support for that product
    model, to give anyone who possesses the object code either (1) a
    copy of the Corresponding Source for all the software in the