Cuong Manh Le fd48e6d795 fix: ensure upstream health checks can handle large DNS responses ...

- Add UpstreamConfig.VerifyMsg() method with proper EDNS0 support
- Replace hardcoded DNS messages in health checks with standardized verification method
- Set EDNS0 buffer size to 4096 bytes to handle large DNS responses
- Add test case for legacy resolver with extensive extra sections

2025-08-15 22:55:47 +07:00

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