# File lib/new_relic/agent/http_clients/typhoeus_wrappers.rb, line 13
        def [](key)
          unless headers.nil?
            result = headers[key]

            # Typhoeus 0.5.3 has a bug where asking the headers hash for a
            # non-existent header will return the hash itself, not what we want.
            result == headers ? nil : result
          end
        end