limit_conn not working

[Abilio Marques]

limit_conn is not working for me. I set up a test in nodejs, I'm doing GET
requests to http://localhost/, they are coming from different connections
(different origin ports), and all the connections are still open until the
very end, still, no response other than 200 is received. I double check
with wireshark.

What am I missing??

Minimal configuration I can reproduce it with: https://paste.ngx.cc/70
Source code for the test: https://paste.ngx.cc/6f
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