Fix http2 transport close

transport/v2rayhttp/client.go

@@ -167,3 +167,8 @@ func (c *Client) dialHTTP2(ctx context.Context) (net.Conn, error) {
 	}()
 	return conn, nil
 }
+
+func (c *Client) Close() error {
+	CloseIdleConnections(c.transport)
+	return nil
+}

transport/v2rayhttp/pool.go

@@ -0,0 +1,13 @@
+package v2rayhttp
+
+import "net/http"
+
+type ConnectionPool interface {
+	CloseIdleConnections()
+}
+
+func CloseIdleConnections(transport http.RoundTripper) {
+	if connectionPool, ok := transport.(ConnectionPool); ok {
+		connectionPool.CloseIdleConnections()
+	}
+}