var request = require('request');
request('http://www.baidu.com', function (error, response, body) {
    console.log('error:', error); // Print the error if one occurred
    console.log('statusCode:', response && response.statusCode); // Print the response status code if a response was received
    console.log('body:', body); // Print the HTML for the Google homepage.
});

This is an example on the official website, but I reported an error here. error: Error: Invalid protocol: null
I don’t know the reason for the protocol
Official githubrequest