autophagy opened a new pull request #18678:
URL: https://github.com/apache/flink/pull/18678


   ## What is the purpose of the change
   
   The purpose of this change is to configure Flink, by default, to bind the 
web/REST endpoint to localhost rather than an externally facing network 
interface, for security reasons.
   
   **Note**: This change depends on 
https://github.com/apache/flink-docker/pull/102 being merged, hence the change 
at 
https://github.com/apache/flink/commit/8fbb6ad775a1fa3e417469a2356cd05f44b51d1c#diff-f61beaac8a23a775d8b61a4e8348998c219a3ea080ff6a0ef14fdb088fd27b16R51.
 I will remove this if/when that PR is merged, I thought it would be useful to 
elicit feedback before then.
   
   ## Brief change log
   
     - *Bound the rest.bind-address in flink-conf.yaml to localhost*
   
   ## Verifying this change
   
   This change is a trivial rework
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not applicable)
   


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