Remove documentation about metadata

[mboetger]

It turns out the metadata tag for network policy in the Android embedder is not connected to the engine.

Addresses: flutter/flutter#183153

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an inaccuracy in the documentation regarding Android network policy configuration within Flutter. It removes instructions for a metadata tag that was found to be non-functional and clarifies the specific scope of the network security configurations, ensuring the documentation provides correct and actionable information for developers.

Highlights

• Documentation Correction: Removed incorrect documentation that instructed users to add a specific metadata entry (io.flutter.network-policy) to the Android manifest for network policy configuration, as this tag is not connected to the Flutter engine.
• Clarity on Network Policy Scope: Added a clarification stating that the described Android network security configuration only controls native Android sockets and does not affect HTTP traffic using Dart sockets.

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Changelog

• src/content/release/breaking-changes/network-policy-ios-android.md
  • Removed documentation instructing the addition of a metadata entry for io.flutter.network-policy in the Android manifest.
  • Removed corresponding XML examples that included the io.flutter.network-policy metadata tag.
  • Added a note clarifying that the network security configuration only applies to native Android sockets and not Dart sockets.

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[gemini-code-assist]

Code Review

This pull request correctly removes documentation for the unused io.flutter.network-policy metadata tag on Android. The changes are applied consistently to the text and code examples. I've added one suggestion to avoid a duplicated note to improve conciseness.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 2e52ec6):

https://flutter-docs-prod--pr13133-remove-network-metadata-3tmtz4tx.web.app

[mboetger]

@Sfshaza

This documentation was added to support the breaking changes in:

flutter/engine#20218
flutter/engine#20492
flutter/engine#20733
Since then, all of the functionality has been removed.

"--disallow-insecure-connections" is used in neither Android nor iOS.
"--domain-network-policy" is used by the Android embedder, but not by the engine. So it does nothing.

This breaking change documentation only re-iterates information about the Android, iOS networking policies and therefore only affects Android, iOS sockets - not Dart/Flutter sockets. This is stated on the page, but the page also makes it seem like there's a way around it.

I have attempted to clear this up and highlight this. But I can't help asking: Should we just remove the documentation?

[sfshaza2]

lgtm