tsconfig': Unable to load schema

https://stackoverflow.com/questions/49056000/all-of-my-json-files-have-problems-loading-reference-schema-from-schemastore-az

问题：
Problems loading reference 'https://json.schemastore.org/tsconfig': Unable to load schema from 'https://json.schemastore.org/tsconfig': Request vscode/content failed

解决方法：

"http.proxy": "http://username:password@hostname:port/",
"http.proxyAuthorization": null,
"http.proxyStrictSSL": true