版本3.5.29
首先，模拟器应该返回一个响应，其中包含用户输入字符串的字符数。但是，即使在使用默认端点URL http://localhost:3979/api/messages之后，每当输入字符串时，都不会发送消息。
日志中显示的内容为：
[04:31:00] Emulator listening on http://[::]:55944
[04:31:01] Failed to start ngrok: undefined
[04:31:01] ngrok may already be running in a different process. ngrok's free tier allows only one instance at a time per host.
[04:31:01] Checking for new version...
[04:31:02] Application is up to date.