I’ve just opened a PR that exposes this argument a little more directly (though the links that @cocreature and @Gary_Verhaegen have linked to will work with any version of dazl, and indeed, any non-Java implementation of the gRPC libraries as they all use the same underlying Google library).
I’ll update this thread when this PR is merged in and a new release is cut (probably some time tomorrow). Thank you for confirming the proxy was indeed the problem!
I don’t have a great way of testing whether or not this flag has any effect unfortunately, so apologies in advance if this ends up taking a few more rounds to figure out!