function-proxies.js

const fs = require('fs');
const proxyConfig = require('d:\\home\\site\\wwwroot\\proxies.json');

module.exports = function (context, req) {
  proxyConfig.proxies.medium = {
    matchCondition: {
       route: '/medium/{user}'
    },
    backendUri: 'https://medium.com/feed/@{user}'
  };
  
  fs.writeFileSync('d:\\home\\site\\wwwroot\\proxies.json', JSON.stringify(proxyConfig));
  
  context.res = {
    status: 200,
    body: "Done"
  };
  context.done();
};