    # File lib/yard/server/static_caching.rb, line 33
          def check_static_cache
            return nil unless adapter.document_root
            cache_path = File.join(adapter.document_root, request.path.sub(/\.html$/, '') + '.html')
            cache_path = cache_path.sub(%r{/\.html$}, '.html')
            if File.file?(cache_path)
              log.debug "Loading cache from disk: #{cache_path}"
              return [200, {'Content-Type' => 'text/html'}, [File.read_binary(cache_path)]]
            end
            nil
          end