> ## Documentation Index
> Fetch the complete documentation index at: https://arklowdocs.io/llms.txt
> Use this file to discover all available pages before exploring further.

# HTTP autoscaler floor

The **HTTP scale API (floor)** target updates the range available to your platform's autoscaler. Your autoscaler continues choosing the live replica count within that range.

This mode uses the shared [status endpoint and authentication contract](/resources/scale-targets/http/index).

## Write contract

Arklow sends:

```http theme={null}
PATCH {endpoint}/scale/autoscaling
Content-Type: application/json
```

```json theme={null}
{
  "min_replicas": 3,
  "max_replicas": 8
}
```

Both values come from the accepted scale setting and remain within the target's configured envelope.

Return a `2xx` response after your platform accepts the new range. The status endpoint can return `settled: false` while the autoscaler or underlying capacity converges.

## Add an HTTP floor target

<Steps>
  <Step title="Prepare the API">
    Implement the shared status endpoint and the autoscaling write endpoint.
  </Step>

  <Step title="Open scale targets">
    Go to [**Scale Targets**](https://app.arklow.io/dashboard/scale-targets), click **New scale target**, and select **HTTP scale API (floor)**.
  </Step>

  <Step title="Enter the endpoint">
    Provide the public HTTPS base URL of the scale API.
  </Step>

  <Step title="Select authentication">
    Choose the HTTP Auth Headers credential containing the headers your API expects.
  </Step>

  <Step title="Select capacity">
    Choose the destination or shared pool served by this platform.
  </Step>

  <Step title="Set the envelope">
    Enter the minimum and maximum replicas available to your autoscaler.
  </Step>

  <Step title="Save">
    Create the target and confirm that its first status observation matches your platform.
  </Step>
</Steps>