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sever name: 1.terarows.com
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time: 2022-02-21 16:05 UTC+08
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server log: (none)
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traceroute:
traceroute to 1.terarows.com (172.67.130.252), 30 hops max, 60 byte packets
1 ZyXEL.Home (192.168.1.1) 0.424 ms 0.552 ms 0.717 ms503 error
2 h254.s98.ts.hinet.net (168.95.98.254) 7.362 ms 7.537 ms 7.937 ms
3 tpe4-3301.hinet.net (168.95.22.98) 8.249 ms 8.395 ms 9.241 ms
4 tyfo-3031.hinet.net (220.128.8.242) 10.483 ms 10.479 ms 11.165 ms
5 tyfo-4011.hinet.net (220.128.8.49) 10.590 ms tyfo-4011.hinet.net (220.128.8.69) 11.151 ms 11.261 ms
6 r31-la.us.hinet.net (202.39.91.5) 146.794 ms 143.987 ms 143.964 ms
7 r32-la.us.hinet.net (202.39.84.86) 141.479 ms 141.237 ms 140.469 ms
8 141.101.72.250 (141.101.72.250) 162.206 ms 162.202 ms 162.261 ms
9 141.101.72.32 (141.101.72.32) 136.882 ms 172.70.208.2 (172.70.208.2) 142.824 ms 172.70.212.2 (172.70.212.2) 136.166 ms
10 1.terarows.com (172.67.130.252) 140.547 ms 140.538 ms 141.476 ms
fl=464f66
h=1.terarows.com
ip=2001:b011:2012:37eb:eea8:6bff:fe2a:120
ts=1645429633.644
visit_scheme=https
uag=Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 OPR/76.0.4017.123
colo=SJC
http=http/3
loc=TW
tls=TLSv1.3
sni=plaintext
warp=off
gateway=off
remarks:
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Both web sites 1.terarows.com (which heavily utilizes AJAX technique) and www.terarows.com (which utilizes only a few AJAX technique) are hosted on the same hardware server.
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The 503 error has been happening to 1.terarows.com from time to time for at least 2 years, but not always.
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The 503 error seems to have been happening from only AJAX calls, but not from HTML elements.
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The 503 error automatically disappeared without my intervention several seconds (or minutes, or hours) later.
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At the moment when 503 error occurred to 1.terarows.com, www.terarows.com had been responding normally.
EDIT to add below:
- traceroute (at 16:38 UTC+8, when 503 error was persistent to 1.terarows.com and www.terarows.com had been responding normally)
traceroute to www.terarows.com (104.21.3.175), 30 hops max, 60 byte packets
1 ZyXEL.Home (192.168.1.1) 0.529 ms 0.792 ms 1.060 ms
2 h254.s98.ts.hinet.net (168.95.98.254) 7.933 ms 7.927 ms 8.483 ms
3 tpe4-3301.hinet.net (168.95.22.98) 8.693 ms 8.688 ms 9.008 ms
4 tyfo-3031.hinet.net (220.128.8.242) 10.738 ms 11.744 ms 11.839 ms
5 tyfo-4011.hinet.net (220.128.8.69) 11.728 ms tyfo-4011.hinet.net (220.128.8.49) 11.830 ms tyfo-4011.hinet.net (220.128.8.73) 11.946 ms
6 r31-la.us.hinet.net (202.39.91.5) 143.317 ms 143.400 ms 143.375 ms
7 r32-la.us.hinet.net (202.39.84.86) 142.647 ms 140.018 ms 145.972 ms
8 141.101.72.250 (141.101.72.250) 141.337 ms 141.905 ms 141.900 ms
9 172.70.212.2 (172.70.212.2) 136.864 ms 172.70.208.2 (172.70.208.2) 144.605 ms 172.70.204.2 (172.70.204.2) 140.989 ms
10 www.terarows.com (104.21.3.175) 140.480 ms 141.471 ms 141.467 ms
EDIT 2: add HTTP server log
172.68.6.95 1.terarows.com - [21/Feb/2022:16:56:37 +0800] "POST /fastcgi/json HTTP/2.0" 503 252 "https://1.terarows.com/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36"
172.68.6.135 1.terarows.com - [21/Feb/2022:16:56:40 +0800] "PRI * HTTP/2.0" 100 138976 "-" "-"
172.68.6.95 1.terarows.com - [21/Feb/2022:16:56:43 +0800] "PRI * HTTP/2.0" 100 425 "-" "-"
172.68.6.35 1.terarows.com - [21/Feb/2022:16:56:43 +0800] "PRI * HTTP/2.0" 100 2827 "-" "-"
172.68.6.147 1.terarows.com - [21/Feb/2022:16:56:43 +0800] "PRI * HTTP/2.0" 100 425 "-" "-"
162.158.166.9 1.terarows.com - [21/Feb/2022:17:10:30 +0800] "GET / HTTP/2.0" 200 287 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 OPR/76.0.4017.123"
162.158.166.9 1.terarows.com - [21/Feb/2022:17:10:30 +0800] "POST /fastcgi/json HTTP/2.0" 503 252 "https://1.terarows.com/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 OPR/76.0.4017.123"
162.158.166.9 1.terarows.com - [21/Feb/2022:17:10:31 +0800] "POST /fastcgi/json HTTP/2.0" 503 252 "https://1.terarows.com/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 OPR/76.0.4017.123"
162.158.166.9 1.terarows.com - [21/Feb/2022:17:10:36 +0800] "PRI * HTTP/2.0" 100 795 "-" "-"
162.158.166.9 1.terarows.com - [21/Feb/2022:17:10:37 +0800] "PRI * HTTP/2.0" 100 425 "-" "-"