---
title: "urlSession(_:task:willPerformHTTPRedirection:newRequest:completionHandler:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/urlsessiontaskdelegate/urlsession(_:task:willperformhttpredirection:newrequest:completionhandler:)"
---

# urlSession(_:task:willPerformHTTPRedirection:newRequest:completionHandler:)

Tells the delegate that the remote server requested an HTTP redirect.

## Declaration

```swift
optional func urlSession(_ session: URLSession, task: URLSessionTask, willPerformHTTPRedirection response: HTTPURLResponse, newRequest request: URLRequest, completionHandler: @escaping @Sendable (URLRequest?) -> Void)
```

```swift
optional func urlSession(_ session: URLSession, task: URLSessionTask, willPerformHTTPRedirection response: HTTPURLResponse, newRequest request: URLRequest) async -> URLRequest?
```

## Parameters

- `session`: The session containing the task whose request resulted in a redirect.
- `task`: The task whose request resulted in a redirect.
- `response`: An object containing the server’s response to the original request.
- `request`: A URL request object filled out with the new location.
- `completionHandler`: A block that your handler should call with either the value of the request parameter, a modified URL request object, or NULL to refuse the redirect and return the body of the redirect response.

## Mentioned in

Downloading files in the background

## Discussion

Discussion This method is called only for tasks in default and ephemeral sessions. Tasks in background sessions automatically follow redirects.