x_user_agent 1.0.0+1

Flutter plugin for reading WebView and system user-agent data on Android and iOS, plus structured device metadata for client hint use cases.

x_user_agent

A Flutter plugin for inspecting mobile user-agent data on Android and iOS.

Usage

final webViewUserAgent = await getWebViewUserAgent();
final systemUserAgent = await getSystemUserAgent();
final userAgentData = await getUserAgentData();
final clientHintsHeaders = await getClientHintsHeaders();

Example app

The bundled example app shows the plugin output in a small demo inspector UI.

Run it from the example directory:

flutter run

Current example structure:

example/lib/
├── main.dart
└── demo/
    ├── demo_app.dart
    ├── demo_page.dart
    └── widgets/
        ├── hero_card.dart
        ├── key_value_list.dart
        ├── section_card.dart
        ├── state_cards.dart
        └── summary_row.dart

XUserAgentData fields

Field	Type	Notes
platform	String?	OS name such as Android or iOS.
platformVersion	String?	OS version string.
model	String?	Device model.
architecture	String?	CPU architecture when available.
appName	String?	App display name.
appVersion	String?	App semantic version.
buildNumber	String?	App build number.
packageName	String?	Android package name or iOS bundle identifier.
mobile	bool?	Whether the device is mobile.
device	String?	Lower-level device identifier.
brand	String?	Device manufacturer or brand.
isEmulator	bool?	true on emulator or simulator when detectable.
darwinVersion	String?	Darwin kernel version on iOS when available.
cfnetworkVersion	String?	CFNetwork version on iOS when available.

All fields are nullable. Missing values are omitted rather than filled with placeholders.

getClientHintsHeaders() example

getClientHintsHeaders() returns a conservative subset derived from local device data.

final headers = await getClientHintsHeaders();

print(headers);

Example output:

{
  'Sec-CH-UA-Platform': '"Android"',
  'Sec-CH-UA-Platform-Version': '"14"',
  'Sec-CH-UA-Mobile': '?1',
  'Sec-CH-UA-Model': '"Pixel 8"',
  'Sec-CH-UA-Arch': '"arm64-v8a"',
}

Example user agents

System	User-Agent	WebView User-Agent
iOS	CFNetwork/897.15 Darwin/17.5.0 (iPhone/6s iOS/11.3)	Mozilla/5.0 (iPhone; CPU iPhone OS 11_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E217
Android	Dalvik/2.1.0 (Linux; U; Android 5.1.1; Android SDK built for x86 Build/LMY48X)	Mozilla/5.0 (Linux; Android 5.1.1; Android SDK built for x86 Build/LMY48X) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/39.0.0.0 Mobile Safari/537.36

These are representative examples. Actual values vary by OS version, device model, WebView version, and runtime environment.