# RoadRunner API reference

> API reference of the RoadRunner extension (yii2\extensions\roadrunner), generated from its PHPDoc.

[API reference](/docs/api/index.md) › RoadRunner

Classes, interfaces, traits and enums of `yii2\extensions\roadrunner`, generated from the PHPDoc of [yii2-extensions/road-runner](https://github.com/yii2-extensions/road-runner) at `main`. Machine-readable catalog: [road-runner.json](https://yii2-framework.github.io/docs/reference/road-runner.json).

## Classes

| Class | Summary |
| --- | --- |
| [`ResponseBody`](/docs/extensions/road-runner/reference/responsebody/index.md) final | Retains failures from streaming `read()` and `eof()` calls that an emitter may consume. |
| [`RoadRunner`](/docs/extensions/road-runner/reference/roadrunner/index.md) final | Runs the RoadRunner request loop for a Yii PSR bridge application. |