How to return HTTP 204 in a Rails controller

This seems to be basic but I'm a Ruby/Rails beginner. I need to simply return HTTP 204 in a controller. Would

respond_to do |format|
  format.html  
end

return a 204?

head :no_content

Tested with Rails 3.2.x, 4.x. It causes the controller method to respond with the 204 No Content HTTP status code.

An example of using this inside a controller method named foobar:

def foobar
  head :no_content
end

Look at the head method:

Return a response that has no content (merely headers). The options argument is interpreted to be a hash of header names and values.

If you don't want to render anything at all you can do this:

render :nothing => true, :status => 204

or like this:

render :nothing => true, :status => 204 and return

Or you can use the :status => 204 part with any other render command