Display and check a request by simulating a call in Alibaba Cloud CLI - Alibaba Cloud CLI

If you need to check whether the request sent to the server is correct and do not want to perform actual operations on cloud resources, you can simulate a call in Alibaba Cloud CLI.

Description of the --dryrun option

To help you check whether the request parameters are valid, Alibaba Cloud CLI provides the --dryrun option. You can use this option to display and check requests. The --dryrun option is mutually exclusive with specific command line options. You cannot simulate calls when you use the following command line options:

--pager: aggregates the results of an operation that involves paging.
--waiter: polls the return results.

Example

Run the following command to check the request information generated when the DescribeInstances operation of Elastic Compute Service (ECS) is called. For more information about this operation, see DescribeInstances.
```
aliyun ecs DescribeInstances --dryrun
```

The following sample code provides an example of returned results, including identity credential, region, and API version.

Skip invoke in dry-run mode, request is:
------------------------------------
POST /?AccessKeyId=AccesskeyId&Action=DescribeInstances&Format=JSON&RegionId=cn-hangzhou&Signature=ni5DWOuI9G0OnKKKB5gTNg%2BS0UU%3D&SignatureMethod=HMAC-SHA1&SignatureNonce=27373c2fcad641b28e355931f408f2ce&SignatureType=&SignatureVersion=1.0&Timestamp=2024-06-27T09%3A35%3A31Z&Version=2014-05-26 HTTPS/1.1
Host: ecs.cn-hangzhou.aliyuncs.com
Accept-Encoding: identity
Content-Type: application/x-www-form-urlencoded
x-acs-action: DescribeInstances
x-acs-version: 2014-05-26
x-sdk-client: golang/1.0.0
x-sdk-core-version: 0.0.1
x-sdk-invoke-type: common