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Website 503 exception frequency is very good. how can I know the exception?

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The website 503 error frequency is very good. In what ways do you know where the error occurs? the website 503 error frequency is very good. In what ways do you know where the error occurs? 503: The website 503 error frequency is very good, how can I locate the error?
Website Error 503 frequency is very good. how can I find the error?

503 EU

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------ Solution --------------------
Nginx: 
Tail-f/var/log/nginx/some. error_log

------ Solution --------------------
I encountered 502/503. The first thing I did was add a proxy (or change the line) to see if the situation has improved.

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