[android-components](../../index.md) / [mozilla.components.concept.fetch](../index.md) / [kotlin.collections.List](index.md) / [toMutableHeaders](./to-mutable-headers.md)

# toMutableHeaders

`fun `[`List`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html)`<`[`Header`](../-header/index.md)`>.toMutableHeaders(): `[`MutableHeaders`](../-mutable-headers/index.md) [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/concept/fetch/src/main/java/mozilla/components/concept/fetch/Headers.kt#L164)