web socket connection time

[Igor Karymov]

Hello. I'm using Nginx as WebSocket proxy and trying to set up the metric
that will show me how quick gateway can establish new connections.
Unfortunately, looks like when I parse logs I have only "response_time"
that in the case of WebSockets  will be better to call "connection time".
Any ideas how can I get time between GET request and 101 response?
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