Post ---- @Summary "Insert key/value pair" @Tags cache @Param key path string true "Key" @Accept json @Param payload body Payload true "Payload" @Produce json @Success 201 {object} Response @Failure 422 {object} api.UnprocessableEntity @Failure 429 {object} api.TooManyRequests @Failure 500 {object} api.InternalServer @Router /api/v1/{key}/ [post].