donphan/config/initializers/rack-attack.rb

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class Rack::Attack
# Rate limits for the API
throttle('api', limit: 150, period: 5.minutes) do |req|
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req.ip if req.path.match(/\A\/api\/v/)
end
self.throttled_response = lambda do |env|
now = Time.now.utc
match_data = env['rack.attack.match_data']
headers = {
'X-RateLimit-Limit' => match_data[:limit].to_s,
'X-RateLimit-Remaining' => '0',
'X-RateLimit-Reset' => (now + (match_data[:period] - now.to_i % match_data[:period])).iso8601(6)
}
[429, headers, [{ error: 'Throttled' }.to_json]]
end
end