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This returns a Server-Timing header on all HTTP responses, which includes details on how long it took the server to render the response. Browsers can show this timing information in the devtools. In Chrome, go to the Network panel, then click a HTTP request, then click the Timing tab.
Config
This directory contains configuration files for Danbooru.
To configure your Danbooru instance, copy danbooru_default_config.rb to danbooru_local_config.rb and edit it. See danbooru_default_config.rb for details.
The only file here that end users need to be concerned about is danbooru_default_config.rb. The rest of the files here are internal Rails-related configuration files that end users shouldn't need to edit.