Run into "[Errno -2] Name or service not known" error in HTTP node or Customzed Tool

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Dify version

0.6.8

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

I want to leverage HTTP node or customzed tool to fetch some data fom my local DB, so I developed Flask service for this, and I can access corresponding API via its swagger UI, but when I use it in HTTP node or customzed tool, [Errno -2] Name or service not known always occurs

✔️ Expected Behavior

I expect HTTP node or customzed tool to return data via my service so that those can be used in successor node

❌ Actual Behavior

Run into "[Errno -2] Name or service not known" error in HTTP node or Customzed Tool