How to proxy api requests with NTLM authentication in a create-react-app project

setupProxy.js

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

module.exports = function(app) {
  app.use(
    "/api",
    proxy({
      agent: new http.Agent({ keepAlive: true }),
      target: "http://example.com/",
      onProxyRes(proxyRes) {
        const header = "www-authenticate";
        proxyRes.headers[header] =
          proxyRes.headers[header] && proxyRes.headers[header].split(",");
      }
    })
  );
};

@TeonWasTaken I'm glad it helped you!