When SetResponseBodyString await e.GetResponseBodyAsString() will takes more than 120s

[lulianqi]

 private async Task ProxyServer_BeforeResponse(object sender, SessionEventArgs e)
        {
            //long string is 1kb
            e.SetResponseBodyString("long string")
            //It takes more than 120s
            await e.GetResponseBodyAsString();
       }

When SetResponseBodyString await e.GetResponseBodyAsString() will takes more than 120s