This API is used to add a tag to an image or update a tag.

Each tag consists of a key and a value. The key contains at most 36 characters, and the value contains at most 43 characters. The key cannot be left blank or an empty character string. The value cannot be left blank but can be an empty character string.
An image can have a maximum of 10 tags.
This API is an idempotent API. If a tag to be added has the same key as an existing tag, but the tag values are different, this tag will be added and overwrite the existing one. If a tag to be added has the same key and value as an existing tag, this tag will not be added.

POST /v2/{project_id}/images/{image_id}/tags

Table 1 lists the parameters in the URI.

**Table 1** Parameter description
Parameter	Mandatory	Type	Description
project_id	Yes	String	Specifies the project ID.
image_id	Yes	String	Specifies the image ID.

Request parameters

Parameter	Mandatory	Type	Description
tag	Yes	Object	Specifies the tag to be added or updated. For details, see Table 2.

**Table 2** Data structure description of the tag field
Parameter	Mandatory	Type	Description
key	Yes	String	Specifies the tag key. The tag key cannot be left blank.
value	Yes	String	Specifies the tag value.

Example request

POST https://{Endpoint}/v2/fd73a4a14a4a4dfb9771a8475e5198ea/images/67e17426-359e-49fb-aa12-0bd1756ec240/tags

{
   "tag": {
      "value": "value1",
      "key": "key1"
   }
}

Abnormal

Returned Value	Description
400 Bad Request	Request error.
401 Unauthorized	Authentication failed.
403 Forbidden	You do not have the rights to perform the operation.
404 Not Found	The requested resource was not found.
500 Internal Server Error	Internal service error.
503 Service Unavailable	The service is unavailable.

Adding an Image Tag