#  - UpgradeToArkUHostInstance

## Overview








## Definition

### Public Parameters

| Parameter Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **Action**     | string  | Corresponding API command name, the current API is `UpgradeToArkUHostInstance`.                      | **Yes** |
| **PublicKey**  | string  | The user's public key can be obtained from [Console](https://console.genesissai.com/uaccount/api_manage)                                             | **Yes** |
| **Signature**  | string  | User signature generated based on public key and API command, see [Signature Algorithm](/docs/api/summary/signature.md)  | **Yes** |

### Request Parameters

| Parameter Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **Region** | string |  |**Yes**|
| **Zone** | string |  |**Yes**|
| **UHostIds.N** | string |  |**Yes**|
| **CouponId** | string |  |No|

### Response Field

| Field Name | Type | Description Information | Required |
|:---|:---|:---|:---|
| **RetCode** | int | Return status code. If it is 0, it means successful return. If it is not 0, it means failure. |**Yes**|
| **Action** | string | Operation command name. |**Yes**|
| **Message** | string | Returns an error message, providing detailed description when `RetCode` is non-zero. |No|
| **UHostSet** | array[string] |  |No|




## Example

### Request Example
    
```
https://api.genesissai.com/?Action=UpgradeToArkUHostInstance
&Region=cn-bj2
&Zone=cn-bj2-04
&UHostIds.0=uhost-xxx
```

### Response Example
    
```json
{
  "Action": "UpgradeToArkUHostInstanceResponse",
  "RetCode": 0,
  "UHostSet": [
    "uhost-xxx"
  ]
}
```