从http.get（）响应获取网址

Question

I need to give my program 3 URLs than print out the server responses in the order of given URLs. I need a way to see from which URL the response came, but I can't find any solution in the documentation. Is there something like "response.getURL" out there? Thanks in advance.

var strings = [];
var ended = 0;
for(int i=0; i<urls.length; i++){
    http.get(urls[i], function(response){
        var wholeData = "";
        response.setEncoding('utf8');
        response.on('error', console.error);
        response.on('data', function(data){
            wholeData += data;
        });
        response.on('end', function(){
            ended ++;
            strings[???] = data;
            if(ended == urls.length)
                printStrings();
        });
    });
}

Answer 1

You are using a single URL for an http.get() : urls[i] .

The response will correspond to that urls[i] .

Answer 2

If you want to assign strings[i] = wholeData you'll have to change how you loop because the value of i inside that event handler will equal urls.length . You could use a library like async which would avoid your having to keep a request counter around and such, but if you want to keep your existing code you need to use a closure around your http.get() to capture i or just use urls.forEach() :

urls.forEach(function(url, i) {
  http.get(url, function(response){
    var wholeData = '';
    response.setEncoding('utf8');
    response.on('error', console.error);
    response.on('data', function(data){
      wholeData += data;
    });
    response.on('end', function(){
      ++ended;
      strings[i] = wholeData;
      if (ended === urls.length)
        printStrings();
    });
  });
});

Or you could group your results by url instead of array index by making strings an object and doing strings[url] = wholeData instead.