about the upstream error: (104: Connection reset by peer)

[Chieu]

hi,
I used nginx for http proxy. And I found a problem in error.log, the record
is:
readv() failed (104: Connection reset by peer) while reading upstream

In this case, nginx didn't try again, just return 400 to the client;

why does nginx not try again? Is there any problem that makes nginx can not
try again?

thank you

----
regards
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