# ResourceUrlsCallbackContext Constructors

- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Type: [ResourceUrlsCallbackContext](/reference/api/csharp/aspire.hosting/resourceurlscallbackcontext.md)
- Kind: `Constructors`
- Members: `1`

Represents a callback context for resource URLs.

## ResourceUrlsCallbackContext(DistributedApplicationExecutionContext, IResource, List<ResourceUrlAnnotation>, CancellationToken)

- Name: `Constructor(DistributedApplicationExecutionContext, IResource, List<ResourceUrlAnnotation>, CancellationToken)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/ResourceUrlsCallbackContext.cs#L17-L82)

Represents a callback context for resource URLs.

```csharp
public class ResourceUrlsCallbackContext
{
    public ResourceUrlsCallbackContext(
        DistributedApplicationExecutionContext executionContext,
        IResource resource,
        List<ResourceUrlAnnotation>? urls = null,
        CancellationToken cancellationToken = default(CancellationToken))
    {
        // ...
    }
}
```

## Parameters

- `executionContext` ([DistributedApplicationExecutionContext](/reference/api/csharp/aspire.hosting/distributedapplicationexecutioncontext.md))
  The execution context.
- `resource` ([IResource](/reference/api/csharp/aspire.hosting/iresource.md))
  The resource.
- `urls` ([List<ResourceUrlAnnotation>](/reference/api/csharp/aspire.hosting/resourceurlannotation.md)) `optional`
  The URLs for the resource.
- `cancellationToken` (`CancellationToken`) `optional`
  A [ResourceUrlsCallbackContext.CancellationToken](/reference/api/csharp/aspire.hosting/resourceurlscallbackcontext/properties.md#cancellationtoken).