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3rd chunk of `content/reference/api/extensions-sdk/BackendV0.md`
e747df3f2ac4a2019898f14ebd99ff66a47a1bfb2c683d850000000100000c05
window.ddClient.backend
 .delete("/some/service")
 .then((value: any) => console.log(value));
```

> [!WARNING]
>
> It will be removed in a future version. Use [delete](HttpService.md#delete) instead.

#### Parameters

| Name | Type | Description |
| :------ | :------ | :------ |
| `url` | `string` | The URL of the backend service. |

#### Returns

`Promise`<`unknown`\>

___

### head

▸ **head**(`url`): `Promise`<`unknown`\>

Performs an HTTP HEAD request to a backend service.

```typescript
window.ddClient.backend
 .head("/some/service")
 .then((value: any) => console.log(value));
```

> [!WARNING]
>
> It will be removed in a future version. Use [head](HttpService.md#head) instead.

#### Parameters

| Name | Type | Description |
| :------ | :------ | :------ |
| `url` | `string` | The URL of the backend service. |

#### Returns

`Promise`<`unknown`\>

___

### request

▸ **request**(`config`): `Promise`<`unknown`\>

Performs an HTTP request to a backend service.

```typescript
window.ddClient.backend
 .request({ url: "/url", method: "GET", headers: { 'header-key': 'header-value' }, data: { ... }})
 .then((value: any) => console.log(value));
```

> [!WARNING]
>
> It will be removed in a future version. Use [request](HttpService.md#request) instead.

#### Parameters

| Name | Type | Description |
| :------ | :------ | :------ |
| `config` | [`RequestConfigV0`](RequestConfigV0.md) | The URL of the backend service. |

#### Returns

`Promise`<`unknown`\>

___

## VM Methods

### execInVMExtension

▸ **execInVMExtension**(`cmd`): `Promise`<[`ExecResultV0`](ExecResultV0.md)\>

Executes a command inside the backend container.
If your extensions ships with additional binaries that should be run inside the backend container you can use the `execInVMExtension` function.

```typescript
const output = await window.ddClient.backend.execInVMExtension(
  `cliShippedInTheVm xxx`
);

console.log(output);
```

> [!WARNING]
>
> It will be removed in a future version. Use [exec](ExtensionCli.md#exec) instead.

#### Parameters

| Name | Type | Description |
| :------ | :------ | :------ |
| `cmd` | `string` | The command to be executed. |

#### Returns

`Promise`<[`ExecResultV0`](ExecResultV0.md)\>

___

### spawnInVMExtension

▸ **spawnInVMExtension**(`cmd`, `args`, `callback`): `void`

Returns a stream from the command executed in the backend container.

```typescript
window.ddClient.spawnInVMExtension(
  `cmd`,
  [`arg1`, `arg2`],
  (data: any, err: any) => {
    console.log(data.stdout, data.stderr);
    // Once the command exits we get the status code
    if (data.code) {
      console.log(data.code);
    }
  }
);
```

> [!WARNING]
>
> It will be removed in a future version.

#### Parameters

| Name | Type | Description |
| :------ | :------ | :------ |
| `cmd` | `string` | The command to be executed. |
| `args` | `string`[] | The arguments of the command to execute. |
| `callback` | (`data`: `any`, `error`: `any`) => `void` | The callback function where to listen from the command output data and errors. |

#### Returns

`void`
Title: BackendV0 Interface: HTTP DELETE, HEAD, REQUEST and VM Methods (execInVMExtension, spawnInVMExtension)
Summary
This section covers the BackendV0 interface's HTTP methods DELETE, HEAD, and REQUEST, as well as VM methods execInVMExtension and spawnInVMExtension. The HTTP methods are used for making requests to backend services. The execInVMExtension method executes commands inside the backend container, while spawnInVMExtension returns a stream from a command executed in the container. Warnings indicate that these methods are deprecated and will be removed in a future version, with replacements suggested where applicable.