webpack dev server CORS issue

Question

I am using webpack-dev-server v1.10.1 to boost up my Redux project and I have the options below:

contentBase: `http://${config.HOST}:${config.PO         


        

Answer 1

There are 2 solutions for this. first one is setting up proxy on the client side, second one is setting CORS on the server. CORS is server issue, server does not allow access from different source. Even using different ports is considered to be different source

First Solution

IN your backend code, you have to set this headers: this is example of in express node.js

app.use((req, res, next) => {
  res.setHeader("Access-Control-Allow-Origin", "*");
  res.setHeader(
    "Access-Control-Allow-Methods",
    "OPTIONS, GET, POST, PUT, PATCH, DELETE"
  );
  res.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization");
  next();
});

Second Solution:

in webpack config.js, if you want to pass any variable, we export

module.exports=function(env){
return {}} 

instead of

module.exports={}

we inject this env through the script.

"dev-server": "webpack-dev-server --env.api='https://jsonplaceholder.typicode.com/users'",

now webpack has access to this env. in webpack.config.js

module.exports = function ({
  api = "https://jsonplaceholder.typicode.com/users",
}) {
  return {
    entry: { main: "./src/index.js" },
    output: {
      path: path.resolve(__dirname, "public"),
      filename: "[name]-bundle.js",
      publicPath: "/",
    },
    mode: "development",
    module: {
      rules: [
        {
          loader: "babel-loader",
          test: /\.js$/,
          exclude: [/node_modules/],
        },
        
        {
          // Load other files, images etc
          test: /\.(png|j?g|gif|ico)?$/,
          use: "url-loader",
        },
        {
          test: /\.s?css$/,
          use: ["style-loader", "css-loader", "sass-loader"],
        },
      ],
    },
    //Some JavaScript bundlers may wrap the application code with eval statements in development.
    //If you use Webpack, using the cheap-module-source-map setting in development to avoid this problem
    devtool: "cheap-module-eval-source-map",
    devServer: {
      contentBase: path.join(__dirname, "public"),
      historyApiFallback: true,
      proxy: {
        "/api": {
          changeOrigin: true,
          cookieDomainRewrite: "localhost",
          target: api,
          onProxyReq: (proxyReq) => {
            if (proxyReq.getHeader("origin")) {
              proxyReq.setHeader("origin", api);
            }
          },
        },
      },
    },
    
  };
};