From b4666cd56a4e24cc006f3b2135a91d0bf23ecc92 Mon Sep 17 00:00:00 2001
From: Pierre Rochard <pierre@rochard.org>
Date: Fri, 23 Apr 2021 14:56:48 -0500
Subject: [PATCH] rpcserver: fix Python gRPC client ALPN property error

There is an open issue for Python gRPC clients that is
currently being debugged https://github.com/grpc/grpc/issues/23172

It can be mitigated server-side by specifying h2 in the metadata header.
---
 config.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/config.go b/config.go
index 690f9a1..d736ff3 100644
--- a/config.go
+++ b/config.go
@@ -344,6 +344,7 @@ func getTLSConfig(cfg *Config) (*tls.Config, *credentials.TransportCredentials,
 	}
 
 	tlsCfg := cert.TLSConfFromCert(certData)
+	tlsCfg.NextProtos = []string{"h2"}
 	restCreds, err := credentials.NewClientTLSFromFile(
 		cfg.TLSCertPath, "",
 	)