What to use instead of `render :text` (and `render nothing: true`) in rails 5.1 and later?

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The non-deprecated way is to use render :plain

Rails Guide on Layouts and Rendering:

2.2.6 Rendering Text

You can send plain text – with no markup at all – back to the browser by using the :plain option to render:

render plain: "OK"

Bonus

Instead of render nothing: true (also removed), one should now use head :ok. Does the same thing: sends http 200 response code, just the headers, no content.

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