The following code generates a java.net.MalformedURLException:

  AddressFromURIString("akka.tcp://Example@node_1:2552”)

Looking at the underlying implementation of AddressFromURIString, the exception 
derives from the use of java.net.URI to parse this string. Which in turn, 
correctly throws an exception according to RFC 2396 (because URI hosts may not 
contain underscore characters).

However, it is currently perfectly permissible to create an instance of 
akka.actor.Address using a DNS hostname (which may contain underscores).

So, at first blush, it would appear that we need something like 
AddressFromDNSString (or similar)?

For myself, I’m hitting this problem whilst building Akka clusters using 
docker-compose with the scale command. In this use case, I have to expect the 
presence of underscores since Docker libnetworking defines Docker containers 
based on DNS names.

Any help or advice here greatly appreciated.

Many thanks,

  Carl.

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