houqp commented on pull request #9230:
URL: https://github.com/apache/arrow/pull/9230#issuecomment-767732713
```
let addr: SocketAddr = format!("0.0.0.0:{}", port).parse()?;
println!("Server listening on localhost:{}", addr.port());
```
Perhaps `let addr: SocketAddr ` is not actually binding to a port and
`addr.port()` is returning `0`?
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