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### How are different response types generated?
[\Magento\Framework\Controller\ResultInterface](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Controller/ResultInterface.php):
- renderResult
- setHttpResponseCode
- setHeader

[Controller\AbstractResult](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Controller/AbstractResult.php):

- *renderResult* - required by interface - applies headers and calls *render*. children must implement this
- setHttpResponseCode
- setHeader
- setStatusHeader

[Controller\Result\Raw](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Controller/Result/Raw.php):

- setContents
- *render* - set response body

[Controller\Result\Json](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Controller/Result/Json.php):

- setData - array
- setJsonData - string
- *render* - processes inline translations, sets application/json header and response body json string

[Controller\Result\Forward](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Controller/Result/Forward.php):

- setModule, setController, setParams
- *forward* - does the trick, modifies request object, marks request not dispatched
- *render* - does nothing, forward must be called manually

[Controller\Result\Redirect](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Controller/Result/Redirect.php):

- setUrl, setPath - custom address
- setRefererUrl, setRefererOrBaseUrl - go back function

[View\Result\Layout](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/View/Result/Layout.php): - renders layout without `default` handle and page layout (1-column etc.)

- *renderResult*
  * event `layout_render_before`
  * event `layout_render_before_$fullActionName`, e.g. `..._checkout_cart_index`
  * render

- *render* - layout->getOutput, translate inline, set response body
- addDefaultHandle = $fullActionName, e.g. `checkout_cart_index`
- addHandle, addUpdate

[View\Result\Page](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/View/Result/Page.php): - wraps layout into page layout
- same events as above
- *render* - renders layout, assigns vars and renders outer page template
- assign - values into viewVars property. default
  Default: requireJs, headContent, headAdditional, htmlAttributes, headAttributes, bodyAttributes, loaderIcon, layoutContent
- addDefaultHandle = $fullActionName + `default`