Check whether the app exists.

GET /v1/{project_id}/app-auth/apps/{app_name}/exists

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
app_name	Yes	String	App name.
project_id	Yes	String	Definition: Project ID. For details, see Obtaining a Project ID and Name. Constraints: The value can contain 1 to 64 characters. Letters, digits, and hyphens (-) are allowed. Range: N/A Default Value: N/A

**Table 2** Query Parameters
Parameter	Mandatory	Type	Description
workspace_id	No	String	Definition: Workspace ID Constraints: If no workspaces are available, the default value is 0. If a workspace is created and used, use the actual value. Range: N/A Default Value: N/A

**Table 3** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	User token, which can be obtained by calling the IAM API that is used for obtaining a user token. The value of X-Subject-Token in the response header is the user token.

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
exists	Boolean	Indicates whether an app exists.

Status code: 401

**Table 5** Response body parameters
Parameter	Type	Description
error_code	String	Definition: ModelArts error code. Range: N/A
error_msg	String	Definition: Error message. Range: N/A

Status code: 403

**Table 6** Response body parameters
Parameter	Type	Description
error_code	String	Definition: ModelArts error code. Range: N/A
error_msg	String	Definition: Error message. Range: N/A

Status code: 404

**Table 7** Response body parameters
Parameter	Type	Description
error_code	String	Definition: ModelArts error code. Range: N/A
error_msg	String	Definition: Error message. Range: N/A

GET https://{endpoint}/v1/{project_id}/app-auth/apps/{app_name}/exists&workspace_id=0

Status code: 200

{
  "exists" : true
}

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