[☠] HTTP Host Availability (the doctor check crashed)
X Due to an error, the doctor check did not complete. If the error message below is not helpful, please let us know about this issue at https://github.com/flutter/flutter/issues.
X HandshakeException: Connection terminated during handshake
解决办法： 1、找到flutter sdk的文件目录，打开下面路径文件
flutter\packages\flutter_tools\lib\src\http_host_validator.dart
2、找到以下链接替换
maven.google.com/ 改为 dl.google.com/dl/android/…
kPubDevHttpHost 改为pub.flutter-io.cn/
kgCloudHttpHost 改为storage.flutter-io.cn/
3、进入到flutter\bin目录，删除cache目录下的flutter_tools.snapshot 文件
4、新开一个cmd，在cmd命令窗口重新运行flutter doctor,问题解决。
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