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Update helloworld README with note on Envoy IPv4 only #1482

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Update helloworld README with note on Envoy IPv4 only #1482

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12 changes: 12 additions & 0 deletions net/grpc/gateway/examples/helloworld/README.md
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Expand Up @@ -172,6 +172,18 @@ static_resources:
> address: docker.for.mac.localhost
> ```

> NOTE: As per
> [Envoy - Envoy Networking](ttps://www.envoyproxy.io/docs/envoy/latest/start/quick-start/run-envoy#envoy-networking),
> if your environment does not enable IPv6, enable only IPv4 in the cluster
> by adding the `dns_lookup_family: V4_ONLY` field:
>
> ```yaml
> ...
> clusters:
> - name: greeter_service
> dns_lookup_family: V4_ONLY
> ```

## Write Client Code

Now, we are ready to write some client code! Put this in a `client.js` file.
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