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# connection(_:didReceive:)

Sent when the connection has received sufficient data to construct the URL response for its request.

```
optional func connection(_ connection: NSURLConnection, didReceive response: URLResponse)
```

## Parameters

`connection`

The connection sending the message.

`response`

The URL response for the connection’s request. This object is immutable and will not be modified by the URL loading system once it is presented to the delegate.

## Discussion

In rare cases, for example in the case of an HTTP load where the content type of the load data is `multipart/x-mixed-replace`, the delegate will receive more than one `connection:didReceiveResponse:` message. When this happens, discard (or process) all data previously delivered by `connection:didReceiveData:`, and prepare to handle the next part (which could potentially have a different MIME type).

The only case where this message is not sent to the delegate is when the protocol implementation encounters an error before a response could be created.

## See Also

[URL Loading System](/documentation/Foundation/url-loading-system)

Interact with URLs and communicate with servers using standard Internet protocols.


---

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