# Querying the extra_specs Value for an ECS Flavor

#### Function

This API is used to query the extra_specs value for a specified ECS flavor.

#### URI

GET /v2.1/{project_id}/flavors/{flavor_id}/os-extra_specs

GET /v2/{project_id}/flavors/{flavor_id}/os-extra_specs

Table 1 describes the parameters in the URI.

Table 1 Parameter description
Parameter | Mandatory | Description
--- | --- | ---
project_id | Yes | Specifies the project ID.
flavors_id | Yes | Specifies the flavor ID.

#### Request

None

#### Response

Table 2 describes the response parameters.

Table 2 Response parameters
Parameter | Type | Description
--- | --- | ---
extra_specs | Map<String,String> | Specifies the key-value pair of an ECS flavor. For details about the returned fields, see the os_extra_specs field description in "Querying Details About Flavors and Extended Flavor Information".

#### Example Request

    GET https://{endpoint}/v2/743b4c0428d94531b9f2add666642e6b/flavors/c3.2xlarge.2/os-extra_specs
    GET https://{endpoint}/v2.1/743b4c0428d94531b9f2add666642e6b/flavors/c3.2xlarge.2/os-extra_specs

#### Example Response

    {
        "extra_specs": {
            "ecs:performancetype": "computingv3",
            "resource_type": "IOoptimizedC3_2"
        }
    }

#### Returned Values

See Returned Values for General Requests.

Parent topic: Flavor Management