最近試了 Angular 的 --proxy-config 一直失敗

If you need to access a backend that is not on localhost, you will need to add the changeOrigin option as follows:

結論，加上這行設定即可

"changeOrigin": true

 {
  "/stationnames": {
    "target": "http://tcgmetro.blob.core.windows.net",
    "secure": false,
    "changeOrigin": true
  }
}

BTW, Angular 7 好像又有新的做法

var HttpsProxyAgent = require('https-proxy-agent');
var proxyConfig = [{
  context: '/api',
  target: 'http://your-remote-server.com:3000',
  secure: false
}];
 
function setupForCorporateProxy(proxyConfig) {
  var proxyServer = process.env.http_proxy || process.env.HTTP_PROXY;
  if (proxyServer) {
    var agent = new HttpsProxyAgent(proxyServer);
    console.log('Using corporate proxy server: ' + proxyServer);
    proxyConfig.forEach(function(entry) {
      entry.agent = agent;
    });
  }
  return proxyConfig;
}
 
module.exports = setupForCorporateProxy(proxyConfig);

參照：

如何在 Angular CLI 建立的 Angular 2 開發環境呼叫遠端 RESTful APIs

Angular 6 Tutorial 13: Configure Proxy for API calls

Angular 7 Using corporate proxy