# Querying AZs

#### Function

This API is used to query all available AZs when you create a load balancer.

One set of AZs is returned. When you create a load balancer, you can select one or more AZs only in the set.

In special scenarios, load balancers must be created in specific AZs. In the returned one or more sets of AZs, you can select as many AZs as you want as long as the selected AZs are in the same set. For example, if two sets [az1,az2] and [az2,az3] are returned, you can select az1 and az2 or az2 and az3, but cannot select az1 and az3.

#### URI

GET /v3/{project_id}/elb/availability-zones

Table 1 Path Parameters
Parameter | Mandatory | Type | Description
--- | --- | --- | ---
project_id | Yes | String | Specifies the project ID.

#### Request Parameters

Table 2 Request header parameters
Parameter | Mandatory | Type | Description
--- | --- | --- | ---
X-Auth-Token | Yes | String | Specifies the token used for IAM authentication.

#### Response Parameters

Status code: 200

Table 3 Response body parameters
Parameter | Type | Description
--- | --- | ---
availability_zones | Array<Array<AvailabilityZone>> | Specifies the AZs that are available during load balancer creation.
request_id | String | Specifies the request ID. The value is automatically generated.

Table 4 AvailabilityZone
Parameter | Type | Description
--- | --- | ---
state | String | Specifies the AZ status. The value can only be ACTIVE.
code | String | Specifies the AZ code.

#### Example Requests

    GET

    https://{ELB_Endpoint}/v3/060576782980d5762f9ec014dd2f1148/elb/availability-zones

#### Example Responses

Status code: 200

Successful request.

    {
      "availability_zones" : [ [ {
        "state" : "ACTIVE",
        "code" : "az1"
      }, {
        "state" : "ACTIVE",
        "code" : "az2"
      }, {
        "state" : "ACTIVE",
        "code" : "az3"
      } ] ],
      "request_id" : "0d799435-259e-459f-b2bc-0beee06f6a77"
    }

#### Status Codes

Status Code | Description
--- | ---
200 | Successful request.

#### Error Codes

See Error Codes.

Parent topic: AZ