zlhgo edited a comment on issue #5596:
URL: https://github.com/apache/apisix/issues/5596#issuecomment-987792571
i have written a plugin for this issue, but there is a problem that the `set
$upstream_name -;` directive must be placed in the location block, so maybe we
are missing a http_server_location_configuration_snippet item.
1. nginx config
```
log_format main escape=default '$remote_addr - [$remote_addr] - $remote_user
[$time_local] "$request" $status $body_bytes_sent "$http_referer"
"$http_user_agent" $request_length $request_time [$upstream_name]
$upstream_addr $upstream_response_length $upstream_response_time
$upstream_status $req_id $host [$scheme]';
location / {
set $upstream_name -;
}
```
2. code
```
function _M.before_proxy(conf, ctx)
-- maybe the ctx.matched_upstream can not access in the access phase
ngx.var.upstream_name = ctx.matched_upstream.name
core.log.warn("set $upstream_name=", ngx.var.upstream_name)
end
```
3. access log
```
192.168.235.25 - [192.168.235.25] - - [07/Dec/2021:10:20:10 +0000] "GET
/hostname HTTP/2.0" 200 33 "-" "curl/7.64.0" 48 0.003
[devops_flask-demo-online_8000] 172.16.214.127:8000 33 0.003 200
20d275ca0a73c2f141be75e22254b119 flask-demo.apisix.net [https]
```
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