[android-components](../../index.md) / [mozilla.components.browser.engine.system](../index.md) / [SystemEngine](index.md) / [defaultUserAgent](./default-user-agent.md)

# defaultUserAgent

`var defaultUserAgent: `[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`?` [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/browser/engine-system/src/main/java/mozilla/components/browser/engine/system/SystemEngine.kt#L137)