Stream stacking occurs when H2 processes HTTP2 RST_STREAM frames.

[silence-coding]

@seanmonstar As described in the issue in hyper, I think the size of the slab should be limited to max_concurrent_streams + max_concurrent_reset_streams . When the size of the slab exceeds the upper limit, the recv_frame method should discard the received Headers and PushPromise frames and send the protocol error to the client.
hyperium/hyper#2877

Drop the Headers and PushPromise frames here and throw a GoAway error.

h2/src/proto/connection.rs

Line 460 in e4cf88c

fn recv_frame(&mut self, frame: Option<Frame>) -> Result<ReceivedFrame, Error> {

[silence-coding]

Requests can be provided to users after REST. However, num_reset_streams must be reduced after the request is processed to ensure that max_reset_streams takes effect.
#30

[lidong14]

@seanmonstar please check this MR

[kevinji]

@silence-coding this should be closed too now that #668 is merged.

[seanmonstar]

Ah yes, thanks for remembering!