Hi,

I am going to use post_action for mirroring the load for performance
testing to new backend.

But according to the doc:

>> Note: this directive "has subtleties" according to Maxim Dounin, so use
at your own risk.

Some questions:

1. Is the post_action blocking to the user request? Or the sub request is
truly async and not affecting to the user?
2. And caveat is using high load env, e.g. stability?


So anyone mind share your experience?

Thanks.
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