From 4e45c2908ac2e0cdd10a95ec95048888ced5301d Mon Sep 17 00:00:00 2001
From: Oliver Gugger <gugger@gmail.com>
Date: Tue, 13 Jul 2021 22:04:28 +0200
Subject: [PATCH] loopd: fix ALPN issue with Python

There is an open issue for Python gRPC clients that is
currently being debugged grpc/grpc#23172

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

diff --git a/loopd/config.go b/loopd/config.go
index e6b0572..a54a2bb 100644
--- a/loopd/config.go
+++ b/loopd/config.go
@@ -319,6 +319,7 @@ func getTLSConfig(cfg *Config) (*tls.Config, *credentials.TransportCredentials,
 	}
 
 	tlsCfg := cert.TLSConfFromCert(certData)
+	tlsCfg.NextProtos = []string{"h2"}
 	restCreds, err := credentials.NewClientTLSFromFile(
 		cfg.TLSCertPath, "",
 	)