在Go中打开到服务器的多个保持活动状态

Question

I have an application that opens a keep-alive to a few remote servers (that I control). It sends a heart beat packet to keep this connection alive before the timeout.

This is how I created my transport:

// Keep-alive connection to the servers
tr := &http.Transport{}
client := &http.Client{Transport: tr}

If I use &http.Transport{MaxIdleConnsPerHost: 2} and set it to > 2, then I'm able to maintain multiple keep-alives per remote connection. However, these additional keep-alives per remote server are created by Go itself when there are concurrent requests that have to be made, and terminated automatically after the timeout expires.

My question is: how can I create the additional keep-alives, say 5 keep-alives per remote server myself when I initialize my transport (when I start Go) and keep them all alive? This would speed up subsequent requests greatly and speed is very important.

Answer 1

Based on inputs from the go-nuts group, to manually open multiple keep-alives to one server, we make that many simultaneous requests. Go then keeps these alive till the remote server times them out (default 5 seconds in Apache).

Please note that these connections cannot be more than the MaxIdleConnsPerHost which is 2 by default.

You can verify this behaviour using netstat -p tcp