Rails render :text vs render :plain

Use render :plain if you want the Rails controller to return plain text.

From Prem in https://github.com/rails/rails/issues/12374:

Per discussion, render :text misdirect people to think that it would render content with text/plain MIME type. However, render :text actually sets the response body directly, and inherits the default response MIME type, which is text/html.

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