?What is the use of a proxy in passport google-oauth20 in nodejs?

i write a authentication for weblog with pasport.js and i see a option , name is proxy. i search about this but i cat find a good asnwer. and i dont know whats this option use for. can someone explain this option for me? thank you.

const GoogleStrategy = require('passport-google-oauth20').Strategy;
const user=require("./../models/users")
// const mongoose = require('mongoose');
// const keys = require('./keys');
// Load user model
//const User = mongoose.model('users');

 module.exports = function(passport){
  passport.use(
    new GoogleStrategy({
      clientID:'===================================================',
      clientSecret:'=================================================',
      callbackURL:'/auth/google/callback',
      proxy: true
    }, (accessToken, refreshToken, profile, done) => {
      // console.log(accessToken);
      // console.log(profile);

      const image = profile.photos[0].value.substring(0, profile.photos[0].value.indexOf('?'));
      
      const newUser = {
        googleID: profile.id,
        firstName: profile.name.givenName,
        lastName: profile.name.familyName,
        email: profile.emails[0].value,
        image: image
      }

      // Check for existing user
      User.findOne({
        googleID: profile.id
      }).then(user => {
        if(user){
          // Return user
          done(null, user);
        } else {
          // Create user
          new User(newUser)
            .save()
            .then(user => done(null, user));
        }
      })
    })
  );

  passport.serializeUser((user, done) => {
    done(null, user.id);
  });

  passport.deserializeUser((id, done) => {
    User.findById(id).then(user => done(null, user));
  });
}