gistfile1.js

var express = require('express');
var app = express();
var port = process.env.PORT || 5000;

var request = require('request');
var zlib = require('zlib');



app.listen(port, function() {
    console.log("Listening on " + port);
    makeRequest();
});



function makeRequest(){
    
    var url = 'https://api.stackexchange.com/2.1/search?pagesize=5&order=desc&sort=activity&intitle=ios development&site=stackoverflow';
    var headers = {'Accept-Encoding': 'gzip'};
    
    var response = request(url, headers);
    
    gunzipJSON(response);
}

function gunzipJSON(response){

    var gunzip = zlib.createGunzip();
    var json = "";

    gunzip.on('data', function(data){
        json += data.toString();
    });
        
    gunzip.on('end', function(){
        parseJSON(json);
    });

    response.pipe(gunzip);
}

function parseJSON(json){

    var json = JSON.parse(json);

    if(json.items.length){
        
        for(var i in json.items){
            
            console.log(json.items[i].title + '\n' + json.items[i].link);
        
        }
    
    }
}

lines 33 and 37 should be response.on('data' ...

lice！