pronchakov opened a new issue, #12884:
URL: https://github.com/apache/apisix/issues/12884
### Current Behavior
When using ENV vars in yaml keys, for example in
```
upstream:
nodes:
"${{HOST}}": 1
```
The actual routing is works, but log messages appears:
> failed to parse domain: ${{HOST}}, error: failed to query the DNS server:
dns server error: 3 name error
But the routing works even with this error message.
### Expected Behavior
Routing should work without error message referring failed dns query on
unresolved variable name.
### Error Logs
2026/01/09 16:02:05 [error] 35#35: *798 [lua] resolver.lua:80:
parse_domain(): failed to parse domain: ${{HOST}}, error: failed to query the
DNS server: dns server error: 3 name error, client: 172.18.0.1, server: _,
request: "GET /img/favicon.svg HTTP/2.0", host: "local.example.ru", referrer:
"https://local.example.ru/";
2026/01/09 16:02:05 [error] 35#35: *798 [lua] upstream.lua:97:
parse_domain_for_nodes(): dns resolver domain: ${{HOST}} error: failed to query
the DNS server: dns server error: 3 name error, client: 172.18.0.1, server: _,
request: "GET /img/favicon.svg HTTP/2.0", host: "local.example.ru", referrer:
"https://local.example.ru/";
### Steps to Reproduce
1. Configure apisix in standalone mode.
2. Add route
```
routes:
- uri: /*
upstream:
nodes:
"${{HOST}}": 1
type: roundrobin
```
3. Add environment variable
`export HOST=localhost:8080`
4. Start apisix
5. Request resource that matches configured route.
6. Observe requested resource (routing works)
7. Observe log message with an error "failed to parse domain: ${{HOST}}"
### Environment
- APISIX version (run `apisix version`): 3.14.1
- Operating system (run `uname -a`): docker image apache/apisix:3.14.1-debian
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`): Not
applicable
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`): Not applicable
- APISIX Dashboard version, if relevant: Not applicable
- Plugin runner version, for issues related to plugin runners: Not applicable
- LuaRocks version, for installation issues (run `luarocks --version`): Not
applicable
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