[I] bug: parse_domain_for_nodes issue [apisix]

[via GitHub]

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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