Get ---- @Summary "Retrieve key/value pair" @Tags cache @Param key path string true "Key" @Produce json @Success 200 {object} Response @Failure 400 {object} api.BadRequest @Failure 404 {object} api.NotFound @Failure 422 {object} api.UnprocessableEntity @Failure 429 {object} api.TooManyRequests @Failure 500 {object} api.InternalServer @Router /api/v1/{key}/ [get].