# 查询扩展接口（废弃） - CinderListExtensionsV3
#### 功能介绍
查询扩展接口。
#### 调用方法
请参见[如何调用API](https://support.huaweicloud.com/api-evs/evs_04_0009.html)。
#### 授权信息
账号具备所有API的调用权限，如果使用账号下的IAM用户调用当前API，该IAM用户需具备调用API所需的权限。
- 如果使用角色与策略授权，具体权限要求请参见[权限和授权项](https://support.huaweicloud.com/api-evs/evs_04_0023.html)。
- 如果使用身份策略授权，当前API调用无需身份策略权限。
 
#### URI
GET /v3/{project_id}/extensions
表1路径参数 
| 参数         | 是否必选 | 参数类型   | 描述                                                                              |
|:---|:---|:---|:---|
| project_id | 是    | String | 项目ID。获取方法请参见[获取项目ID](https://support.huaweicloud.com/api-evs/evs_04_0046.html)。 |
   
#### 请求参数
表2请求Header参数 
| 参数           | 是否必选 | 参数类型   | 描述                                                                                                  |
|:---|:---|:---|:---|
| X-Auth-Token | 是    | String | 用户Token。 通过调用IAM服务获取用户Token接口获取（响应消息头中X-Subject-Token的值）。 |
   
#### 响应参数
**状态码：200**
表3响应Body参数 
| 参数         | 参数类型                                                                      | 描述      |
|:---|:---|:---|
| extensions | Array of [Extension] objects | 扩展接口列表。 |
   
 表4Extension 
| 参数          | 参数类型                                                            | 描述                                                                                                   |
|:---|:---|:---|
| alias       | String                                                          | 扩展的别名。                                                                                               |
| description | String                                                          | 描述。                                                                                                  |
| links       | Array of [Link] objects | 云硬盘传递的链接。                                                                                            |
| name        | String                                                          | 云硬盘传递的名称。                                                                                            |
| updated     | String                                                          | 最后的更新时间。 时间格式：UTC YYYY-MM-DDTHH:MM:SS.+XX.XX，其中+XX.XX表示时区。 |
   
 表5Link 
| 参数   | 参数类型   | 描述                                                                                                                                                             |
|:---|:---|:---|
| href | String | **参数解释** 对应的快捷链接。 **取值范围** 不涉及。  |
| rel  | String | **参数解释** 快捷链接标记名称。 **取值范围** 不涉及。 |
   
**状态码：400**
表6响应Body参数 
| 参数    | 参数类型                                                    | 描述                                                                                                                                                                  |
|:---|:---|:---|
| error | [Error] object | **参数解释** 出现错误时，返回的错误信息。 **取值范围** 不涉及。 |
   
 表7Error 
| 参数      | 参数类型   | 描述                                                                                                                                                                                                                                            |
|:---|:---|:---|
| code    | String | **参数解释** 出现错误时，返回的错误码。 **取值范围** 错误码和其对应的含义请[参考错误码说明](https://support.huaweicloud.com/api-evs/evs_04_0038.html)。 |
| message | String | **参数解释** 出现错误时，返回的错误消息。 **取值范围** 不涉及。                                                                           |
   
#### 请求示例
```
GET https://{endpoint}/v3/{project_id}/extensions
```
#### 响应示例
**状态码：200**
OK
```
{
  "extensions" : [ {
    "updated" : "2013-04-18T00:00:00+00:00",
    "name" : "SchedulerHints",
    "links" : [ ],
    "alias" : "OS-SCH-HNT",
    "description" : "Pass arbitrary key/value pairs to the scheduler."
  }, {
    "updated" : "2011-06-29T00:00:00+00:00",
    "name" : "Hosts",
    "links" : [ ],
    "alias" : "os-hosts",
    "description" : "Admin-only host administration."
  }, {
    "updated" : "2011-11-03T00:00:00+00:00",
    "name" : "VolumeTenantAttribute",
    "links" : [ ],
    "alias" : "os-vol-tenant-attr",
    "description" : "Expose the internal project_id as an attribute of a volume."
  }, {
    "updated" : "2011-08-08T00:00:00+00:00",
    "name" : "Quotas",
    "links" : [ ],
    "alias" : "os-quota-sets",
    "description" : "Quota management support."
  }, {
    "updated" : "2011-08-24T00:00:00+00:00",
    "name" : "TypesManage",
    "links" : [ ],
    "alias" : "os-types-manage",
    "description" : "Types manage support."
  }, {
    "updated" : "2013-07-10T00:00:00+00:00",
    "name" : "VolumeEncryptionMetadata",
    "links" : [ ],
    "alias" : "os-volume-encryption-metadata",
    "description" : "Volume encryption metadata retrieval support."
  }, {
    "updated" : "2012-12-12T00:00:00+00:00",
    "name" : "Backups",
    "links" : [ ],
    "alias" : "backups",
    "description" : "Backups support."
  }, {
    "updated" : "2013-07-16T00:00:00+00:00",
    "name" : "SnapshotActions",
    "links" : [ ],
    "alias" : "os-snapshot-actions",
    "description" : "Enable snapshot manager actions."
  }, {
    "updated" : "2012-05-31T00:00:00+00:00",
    "name" : "VolumeActions",
    "links" : [ ],
    "alias" : "os-volume-actions",
    "description" : "Enable volume actions"
  }, {
    "updated" : "2013-10-03T00:00:00+00:00",
    "name" : "UsedLimits",
    "links" : [ ],
    "alias" : "os-used-limits",
    "description" : "Provide data on limited resources that are being used."
  }, {
    "updated" : "2012-05-31T00:00:00+00:00",
    "name" : "VolumeUnmanage",
    "links" : [ ],
    "alias" : "os-volume-unmanage",
    "description" : "Enable volume unmanage operation."
  }, {
    "updated" : "2011-11-03T00:00:00+00:00",
    "name" : "VolumeHostAttribute",
    "links" : [ ],
    "alias" : "os-vol-host-attr",
    "description" : "Expose host as an attribute of a volume."
  }, {
    "updated" : "2013-07-01T00:00:00+00:00",
    "name" : "VolumeTypeEncryption",
    "links" : [ ],
    "alias" : "encryption",
    "description" : "Encryption support for volume types."
  }, {
    "updated" : "2013-06-27T00:00:00+00:00",
    "name" : "AvailabilityZones",
    "links" : [ ],
    "alias" : "os-availability-zone",
    "description" : "Describe Availability Zones."
  }, {
    "updated" : "2013-08-02T00:00:00+00:00",
    "name" : "Qos_specs_manage",
    "links" : [ ],
    "alias" : "qos-specs",
    "description" : "QoS specs support."
  }, {
    "updated" : "2011-08-24T00:00:00+00:00",
    "name" : "TypesExtraSpecs",
    "links" : [ ],
    "alias" : "os-types-extra-specs",
    "description" : "Type extra specs support."
  }, {
    "updated" : "2013-08-08T00:00:00+00:00",
    "name" : "VolumeMigStatusAttribute",
    "links" : [ ],
    "alias" : "os-vol-mig-status-attr",
    "description" : "Expose migration_status as an attribute of a volume."
  }, {
    "updated" : "2012-08-13T00:00:00+00:00",
    "name" : "CreateVolumeExtension",
    "links" : [ ],
    "alias" : "os-image-create",
    "description" : "Allow creating a volume from an image in the Create Volume v1 API."
  }, {
    "updated" : "2014-01-10T00:00:00-00:00",
    "name" : "ExtendedServices",
    "links" : [ ],
    "alias" : "os-extended-services",
    "description" : "Extended services support."
  }, {
    "updated" : "2012-06-19T00:00:00+00:00",
    "name" : "ExtendedSnapshotAttributes",
    "links" : [ ],
    "alias" : "os-extended-snapshot-attributes",
    "description" : "Extended SnapshotAttributes support."
  }, {
    "updated" : "2012-12-07T00:00:00+00:00",
    "name" : "VolumeImageMetadata",
    "links" : [ ],
    "alias" : "os-vol-image-meta",
    "description" : "Show image metadata associated with the volume."
  }, {
    "updated" : "2012-03-12T00:00:00+00:00",
    "name" : "QuotaClasses",
    "links" : [ ],
    "alias" : "os-quota-class-sets",
    "description" : "Quota classes management support."
  }, {
    "updated" : "2013-05-29T00:00:00+00:00",
    "name" : "VolumeTransfer",
    "links" : [ ],
    "alias" : "os-volume-transfer",
    "description" : "Volume transfer management support."
  }, {
    "updated" : "2014-02-10T00:00:00+00:00",
    "name" : "VolumeManage",
    "links" : [ ],
    "alias" : "os-volume-manage",
    "description" : "Allows existing backend storage to be 'managed' by Cinder."
  }, {
    "updated" : "2012-08-25T00:00:00+00:00",
    "name" : "AdminActions",
    "links" : [ ],
    "alias" : "os-admin-actions",
    "description" : "Enable admin actions."
  }, {
    "updated" : "2012-10-28T00:00:00-00:00",
    "name" : "Services",
    "links" : [ ],
    "alias" : "os-services",
    "description" : "Services support."
  } ]
}
```
**状态码：400**
Bad Request
```
{
  "error" : {
    "message" : "XXXX",
    "code" : "XXX"
  }
}
```
#### 状态码
| 状态码 | 描述          |
|:---|:---|
| 200 | OK          |
| 400 | Bad Request |
   
#### 错误码
请参见[错误码](https://support.huaweicloud.com/api-evs/evs_04_0038.html)。