Well, I was just assuming that no live upstreams were availbale, but this is
not the case. At least, this is not logged (access or error).
Here are the lines from access_log i'm talking about (see the difference on
$upstream_addr):
----
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for" '
'$request_length $request_time '
'"$upstream_addr" "$upstream_response_length"
"time=$upstream_response_time" "$host" "$limit_req_status"';
----
----
208.115.199.18 - - [29/Sep/2021:12:42:43 +0200] "GET /login HTTP/1.1" 200
150 "https://example.com"; "Mozilla/5.0+(compatible; UptimeRobot/2.0;
http://www.uptimerobot.com/)" "-" 408 0.105 "127.0.0.1:81" "0" "time=0.000"
"example.com" "PASSED"
----
----
208.115.199.18 - - [29/Sep/2021:12:43:35 +0200] "GET /login HTTP/1.1" 502
150 "https://example.com"; "Mozilla/5.0+(compatible; UptimeRobot/2.0;
http://www.uptimerobot.com/)" "-" 408 0.000 "http_backend" "0" "time=0.000"
"example.com" "PASSED"
----
Posted at Nginx Forum:
https://forum.nginx.org/read.php?2,292491,292494#msg-292494
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