# Backend URL Configuration

## Overview

See [Backend URL Configuration](/paas/sdk/unified-vpn-sdk/setup/backend-url-configuration.md)

## Default URL Behavior

Out of the box, the SDK follows this URL precedence:

1. URLs passed by the user via the `hostURLs` config. These take the highest priority.
2. Default host URLs integrated into the SDK. If no URLs are specified via the config, the SDK falls back to these production URLs.

{% hint style="info" %}

* The exact default production URLs are not specified in the SDK documentation.
* The SDK does not include any predefined stage URLs - only production URLs. To use the SDK with a staging environment, you must specify the stage URLs via `ClientInfo` or `pango_default_urls.json`.
  {% endhint %}

## Customizing Backend URLs

You can override the default production URLs by adding `hostURLs` in the Configuration.

```swift
let hydraConfiguration = HydraConfiguration(
    // ...
    hostUrls: ["https://url-1.net", "https://url-2.com", "https://url-3.com"]
    // ...
)
```


---

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