Feature request from springimport, posted on GitHub Sep 12, 2016
What about new api method like [DELETE] /V1/carts/{cartId}/items. I think this is desired method.
[DELETE] /V1/carts/{cartId}/items
Documentation quoteCartItemRepositoryV1.
Comment from mbrinton01, posted on GitHub Sep 21, 2016
@springimport, I've marked this issue as an improvement so it will be moved to Community Forums. Thank you for your feedback to improve Magento 2.