berkaycirak opened a new issue, #12512:
URL: https://github.com/apache/apisix/issues/12512
### Current Behavior
Hey, I am using environment variables on `apisix.yaml`. Everything works
well and my services are responding without an issue but I couldn't understand
why I am getting that parsing error eventhough there is no issue on the
functionality?
```
2025/08/12 10:55:20 [error] 36#36: *13787 [lua] upstream.lua:97:
parse_domain_for_nodes(): dns resolver domain: ${{UPSTREAM_ADDRESS}} error:
failed to query the DNS server: dns server error: 3 name error, client:
172.18.0.1, server: _, request: "GET /ping HTTP/1.1", host: "localhost:9080"
```
#### Apisix Yaml
```yaml
routes:
- id: health
uri: /_gateway/health
methods: ["GET"]
plugins:
mocking:
response_status: 200
content_type: application/json
response_example: '{"status":"ok"}'
- id: ping-pong
uri: /ping
methods: ["GET"]
upstream_id: 1
upstreams:
- id: 1
type: roundrobin
nodes:
"${{UPSTREAM_ADDRESS}}:${{UPSTREAM_PORT}}": 1 # value is "weight".
That means, coming requests to nodes will be splitted based on that weight.
#END
```
### Expected Behavior
_No response_
### Error Logs
_No response_
### Steps to Reproduce
-
### Environment
Standalone mode
```yaml
# Minimal APISIX config for standalone mode
apisix:
node_listen:
- ${PORT}
enable_admin: false
deployment:
role: data_plane # Standalone mode, no etcd
role_data_plane:
config_provider: yaml
```
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