Flutter安装后出现HTTP host not reachable.

HTTP host not reachable 问题

Flutter安装好配置环境变量之后在cmd运行Flutter doctor出现如下问题:

HTTP host https://maven.google.com/ is not reachable.Reason: An error occurred while checking the HTTP host

解决办法

1、找到flutter sdk的文件目录，打开flutter\packages\flutter_tools\lib\src\http_host_validator.dart文件

2、找到如下代码段落：

/// Android specific required HTTP hosts.
const List androidRequiredHttpHosts = [
  'https://maven.google.com/',
];

将其中的https://maven.google.com/ 修改为https://dl.google.com/dl/android/maven2/

3、去到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。