Error 502 Bad gateway mysite

I make a selection and form the price in pdf, it takes a long time to compile, in the logs I see that the answer is 200
"GET /assets/modules/wholesale/optprice.php?spare=on HTTP/1.0" 200 1561443 "https://mysite/manager/index.php?a=112&id=11" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0"

then everything is ok, but in the browser I see an error

in the Cloudflare panel I added mysite/manager/* and mysite/assets/* in Page Rules as Security is disabled, but it did not crash, what else could be the problem?

when I disable traffic through Cloudflare, then uploading to pdf works without errors

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