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# close(code:reason:metadata:)

Send a WebSocket close frame on a connection.

```
func close(code: NWProtocolWebSocket.CloseCode = .protocolCode(.normalClosure), reason: String? = nil, @ProtocolMetadataBuilder metadata builder: () -> [NWProtocolMetadata] = {[]}) async throws
```

## Parameters

`code`

Optional close code. Defaults to normal closure.

`reason`

Optional reason string containing details about the closure.

`builder`

A builder for specifying metadata about the content to send.

## Discussion

This may be called before the connection is ready, in which case
the send will be enqueued until the connection is ready to send.

---

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