Status code 0

[Sébastien Rebecchi]

Hello

What does it mean when nginx returns an http status code 0?

We see that cause we monitor nginx response status code, which is used as
front of our apps. The apps themselves can not return 0, only 200 or 500.
So it seems issue here comes from nginx itself which can not process the
connection under high peak of load, but why 0, is that expected?

Thanks
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