map $http_user_agent $dumpdom_ua { default 0; "~Prerender" 0; "~*googlebot" 1; "~*bingbot" 1; "~*yandex" 1; "~*baiduspider" 1; "~*twitterbot" 1; "~*baiduspider" 1; "~*facebookexternalhit" 1; "~*rogerbot" 1; "~*linkedinbot" 1; "~*embedly" 1; "~*quora link preview" 1; "~*showyoubot" 1; "~*outbrain" 1; "~*pinterest" 1; "~*slackbot" 1; "~*vkShare" 1; "~*Slack-ImgProxy" 1; "~*Slackbot-LinkExpanding" 1; "~*Site Analyzer" 1; "~*SiteAnalyzerBot" 1; "~*Viber" 1; "~*Whatsapp" 1; "~*Telegram" 1; "~*W3C_Validator" 1; "~*DuckDuckBot" 1; "~*redditbot" 1; "~*Discordbot" 1; "~*Viber" 1; } map $args $dumpdom { default $dumpdom_ua; "~(^|&)_escaped_fragment_=" 1; }