Add h2Alpn option for TLS ClientHello

client.go

@@ -85,6 +85,7 @@ type DialOptions struct {
 	Chain        *Chain
 	Host         string
 	HeaderConfig map[string]string
+	H2Alpn       bool
 }
 
 // DialOption allows a common way to set DialOptions.
@@ -118,6 +119,13 @@ func HeaderConfigDialOption(HeaderConfig map[string]string) DialOption {
 	}
 }
 
+// H2AlpnDialOption specifies is use HTTP2 in ALPN for TLS ClientHello
+func H2AlpnDialOption(useH2Alpn bool) DialOption {
+	return func(opts *DialOptions) {
+		opts.H2Alpn = useH2Alpn
+	}
+}
+
 // HandshakeOptions describes the options for handshake.
 type HandshakeOptions struct {
 	Addr       string
@@ -131,6 +139,7 @@ type HandshakeOptions struct {
 	KCPConfig  *KCPConfig
 	QUICConfig *QUICConfig
 	SSHConfig  *SSHConfig
+	H2Alpn     bool
 }
 
 // HandshakeOption allows a common way to set HandshakeOptions.
@@ -213,6 +222,13 @@ func SSHConfigHandshakeOption(config *SSHConfig) HandshakeOption {
 	}
 }
 
+// H2AlpnHandshakeOption specifies is use HTTP2 in ALPN for TLS ClientHello.
+func H2AlpnHandshakeOption(useH2Alpn bool) HandshakeOption {
+	return func(opts *HandshakeOptions) {
+		opts.H2Alpn = useH2Alpn
+	}
+}
+
 // ConnectOptions describes the options for Connector.Connect.
 type ConnectOptions struct {
 	Addr         string