Type Alias PushCallback 

pub type PushCallback = Arc<dyn Fn(u64, u16, Bytes, SystemTime) + Send + Sync + 'static>;

后端推送回调 Backend push callback with the producing connection generation attached.

The generation is part of the delivery identity: callers must not infer a push source by probing whichever connection happens to be current after the frame was received.

Aliased Type

pub struct PushCallback { /* private fields */ }