Sometimes Nginx $upstream_response_time returns 2 values.
xxx.xxx.xxx.xxx - - [08/Nov/2017:23:43:25 +0900] "GET /xxxxxxxxxxxx HTTP/2.0" 200 284 "https://xxxxxxxxxxx" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36" "-" "0.015" "0.001, 0.014"
" 0.001, 0.014 " this is a $upstream_response_time. Why does this has two values?
Log format:
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for" '
'"$request_time" "$upstream_response_time"';
Note that this is spelled out in the documentation :
Times of several responses are separated by commas and colons like addresses in the $upstream_addr variable.
This means that it made multiple requests to a backend, most likely you either have a bare proxy_pass
host that resolves to different IPs (frequently the case with something like Amazon ELB as an origin), are you have a configured upstream
that has multiple servers. Unless disabled, the proxy
module will make round robin attempts against all healthy backends. This can be configured from proxy_next_upstream_* directives.
For example if this is not the desired behavior, you can just do:
proxy_next_upstream off;
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