siblingGrace static method

Duration siblingGrace(
  1. Duration timeout
)

A 与 AAAA 这对兄弟查询的额外等待窗口 / Grace window granted to the sibling of an already answered A / AAAA query.

Web 端把 A 与 AAAA 拆成两次独立的 HTTPS 请求，无需该窗口；保留同名方法是 为了让两个平台分支共享同一套 API 表面 / The web issues A and AAAA as two independent HTTPS requests and needs no such window; the method exists so both platform branches expose the same API surface.

Implementation

static Duration siblingGrace(Duration timeout) => Duration.zero;