您好我想询问有关nodejs google appengine的内容，我只需按照此处的说明操作：https://cloud.google.com/appengine/docs/flexible/nodejs/quickstart
但在npm install步之后我收到了这个错误：
npm ERR! Windows_NT 10.0.15063
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\mulky\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "update"
npm ERR! node v6.3.1
npm ERR! npm v3.10.6
npm ERR! code ECONNRESET
npm ERR! network tunneling socket could not be established, cause=self signed certificate
npm ERR! network This is most likely not a problem with npm itself
npm ERR! network and is related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly. See: 'npm help config'
npm ERR! Please include the following file with any support request:
npm ERR! D:\Repo\GCP\nodejs-docs-samples\appengine\hello-world\npm-debug.log
请帮我解决这个问题，谢谢：）
注意：我认为我没有任何网络问题，我不使用任何代理，哦，为了您的信息我已经重新安装nodejs包括npm但它仍然显示相同的错误。