reactjs - 使用 http-proxy-middleware 配置 setupProxy.js

Question

我正在尝试使用 HTTP-proxy-middleware 在 create-react-app 中配置代理服务器 ( setupProxy.js )，以访问天气数据 API ( api.darksky.net )。

我按照 React 文档 ( https://facebook.github.io/create-react-app/docs/proxying-api-requests-in-development#configuring-the-proxy-manually ) 中的步骤进行操作，但仍然遇到 CORS 问题。

我尝试在 fetch 调用中添加“https://cors-anywhere.herokuapp.com/”作为 API URL 的前缀。 ' ( https://github.com/Rob--W/cors-anywhere/ )，这正在工作，但对我来说感觉有点老套，我宁愿自己完成这个工作。

这是最终从 componentDidMount 内部调用的函数:

  fetchWeatherDataAuto = () => {
    let lat = this.state.locInfo.lat;
    let lon = this.state.locInfo.lon; 

    fetch(`https://api.darksky.net/forecast/${apiKey.darkSky_key}/${lat},${lon}`)
      .then(response => response.json())
      .then(response => console.log("Weather Response: ", response));
  }

这是我的 setupProxy.js 文件的代码:

const proxy = require('http-proxy-middleware');

module.exports = function(app) {
    app.use(proxy("/forecast", {
          target: "https://api.darksky.net/",
          changeOrigin: true
    }));
}

此错误显示在我的控制台中:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading >the remote resource at >https://api.darksky.net/forecast/{myAPIKey}/9.739>9056,-82.8484079. (Reason: CORS header ‘Access-Control-Allow-Origin’ >missing).

Answer 1

在这种情况下不需要设置自定义代理...

只需将其添加到您的 package.json 中即可:

{
  "name": "test1",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.7.0",
    "react-dom": "^16.7.0",
    "react-scripts": "2.1.3"
  },
  "proxy": "https://api.darksky.net", // <= add this here...
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ]
}

然后在你的 App.js 中

  componentDidMount() {
    fetch(`/forecast/${YOUR_API_KEY_HERE}/${lat},${lon}`)
      .then(response => response.json())
      .then(response => console.log('Weather Response: ', response));
  }

它应该可以工作...(请注意，所有异步调用都应该在 componentDidMount 生命周期方法中完成...)