---
title: "handleNewFlow(_:completionHandler:)"
framework: networkextension
role: symbol
role_heading: Instance Method
path: "networkextension/nefiltercontrolprovider/handlenewflow(_:completionhandler:)"
---

# handleNewFlow(_:completionHandler:)

Handle a request for new filtering rules.

## Declaration

```swift
func handleNewFlow(_ flow: NEFilterFlow, completionHandler: @escaping @Sendable (NEFilterControlVerdict) -> Void)
```

```swift
func handleNewFlow(_ flow: NEFilterFlow) async -> NEFilterControlVerdict
```

## Parameters

- `flow`: A NEFilterFlow object containing details about the flow of network content.
- `completionHandler`: A block to be executed when the rules have been updated.

## Discussion

Discussion The system calls this method when the Filter Data Provider indicates that it needs more rules before making a decision about a new flow. The Filter Control Provider is expected to fetch new rules and write them to disk in a location that is readable by the Filter Data Provider. In addition to updating the rules, the Filter Control Provider can itself make a pass/block decision for the new flow, and return it when executing the completionHandler block. NEFilterControlProvider subclasses must override this method.

## See Also

### Handling requests for new rules

- [notifyRulesChanged()](networkextension/nefiltercontrolprovider/notifyruleschanged().md)