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                                            StartAt24

[QUESTION] Time-consuming task in `OnEvent` will panic `concurrent write to websocket connection`

I have find this setting, and it seems solved my problem. Here is my code: ```Go opt := engineio.Options{ PingTimeout: time.Minute*2, PingInterval: time.Minute} server, err:= socketio.NewServer(&opt) ``` It wonn't case...

add include <cstdlib>

fix some build error.

How can I use aggregate？

> How can I use aggregate？ > such as： > db.mycol.aggregate([{$group : {_id : "$by_user", num_tutorial : {$sum : 1}}}]) I have the same problem! Have you solved it?