0002-00000220

Problem description

The x-oss-signature field in the request is empty.

Causes

You initiated a request that uses Signature V4, but the x-oss-signature field in the request parameters is empty.

Examples

You included signature information for Signature V4 in the request URL, but the x-oss-signature field in the request parameters is empty.

GET /oss.jpg?x-oss-signature-verion=OSS4-HMAC-SHA256&x-oss-credential=***&x-oss-expires=1141889120&x-oss-additional-headers=host&x-oss-signature= HTTP/1.1
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
Date: Tue, 20 Dec 2022 08:48:18 GMT

The x-oss-signature parameter is required. It specifies the calculated signature value.

Solutions

A request URL that uses a v4 signature must include four required parameters: x-oss-signature-version, x-oss-credential, x-oss-expires, and x-oss-signature. It can also include one optional parameter: x-oss-additional-headers. The following code provides a valid example:

GET /oss.jpg?x-oss-signature-verion=OSS4-HMAC-SHA256&x-oss-credential=LTAI****************/20221220/cn-hangzhou/oss/aliyun_v4_request&x-oss-expires=1141889120&x-oss-additional-headers=host&x-oss-signature=8u**a3 HTTP/1.1
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
Date: Tue, 20 Dec 2022 08:48:18 GMT

References

• For information about how to use Alibaba Cloud SDKs to initiate a request that uses the V4 signature, see Overview.

• Calculate the signature:

  • For information about how to calculate the V4 signature, see Calculate V4 signature by using OSS SDK for Python.

  • For information about how to specify the signature logic based on the V1 signature, see Overview.

  If the server returns a response that contains the StringToSign parameter, you must check whether the value of the StringToSign parameter on the server is the same as the string before calculation.