1 files changed, 29 insertions, 0 deletions
diff --git a/ipn/ipnserver/server_h2c.go b/ipn/ipnserver/server_h2c.go
new file mode 100644
index 000000000..31270ea90
--- /dev/null
+++ b/ipn/ipnserver/server_h2c.go
@@ -0,0 +1,29 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Enabling H2C for LocalAPI is not Windows-specific.
+// However, Windows is expected to benefit the most
+// due to additional, potentially slow authentication steps
+// performed for each new named pipe connection.
+// As an experiment, we are enabling it on Windows first.
+//go:build windows
+
+package ipnserver
+
+import (
+	"net/http"
+
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
+)
+
+func init() {
+	addH2C = func(s *http.Server) {
+		h2s := &http2.Server{}
+		s.Handler = h2c.NewHandler(s.Handler, h2s)
+		// [http2.ConfigureServer] sets up a server shutdown handler that gracefully
+		// closes connections when [http.Server.Shutdown] is called.
+		// Otherwise, it leaks goroutines.
+		http2.ConfigureServer(s, h2s)
+	}
+}