what comes after "def check_logged_in" line for site "ads"?

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Question:what comes after "def check_logged_in" line for site "ads"?

1.in the controller: respond_to do |format| ... end

2.errors.add_to_base("there was an error")

3.format (that period is a concatenation period)

4.authenticate_or_request_with_http_basic("Ads") do |username, password|

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  1. what comes after "def check_logged_in" line for site "ads"?
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