What is どうって in どうってことありません?


> どうってことありません。

I know it means "It was nothing."

But, what is どうって?




  * どうってことない
  * どうってことありません
  * どうと言うこともない
  * etc.

are all variations of a set phrase meaning "it's nothing" "it's no big deal".
Here どう is just the usual question word and って or と the usual quoting
particle. Literally the phrase means that it is not something you would
ask/enquire about by saying どう.

