使用XMLHttpRequest进行Https请求 [英] Https request with XMLHttpRequest

问题描述

我在问如何使用像https：// www这样的URL来请求请求。 gmail.com
我正在尝试这样的事情，但状态码是0

  var http = new XMLHttpRequest（ ）; 
 var url =https://www.gmail.com; 
 
 http.open（GET，url）; 
 http.onreadystatechange = function（）{//当状态改变时调用一个函数。 
 if（http.readyState == 4&& http.status == 200）{
 //alert (http.responseText）; 
 print（ok）
} else {
 print（can not connect）
 print（code：+ http.status）
 print（http .responseText）
} 
} 
 http.send（null）; 
  

我始终得到无法连接代码0并且没有任何回应

有什么想法？

解决方案

这会失败，原因有两个：

1）网址https://www.gmail.com实际上会尝试将您重定向到https://mail.google.com/mail/，然后依次会尝试将您重定向到登录页面。此重定向不会被列为错误

2）但更重要的是，您不能将XMLHttpRequests创建到不同的域，除非该域支持CORS（http：// www .html5rocks.com / EN /教程/ CORS /）。 GMail不支持CORS，所以这个请求将不起作用。

Im able to do Http requests (POST/GET) with XMLHttpRequest.

I'm asking how to do requests with URLs like "https://www.gmail.com" I was trying something like this but the status code is 0

var http = new XMLHttpRequest();
    var url = "https://www.gmail.com";

    http.open("GET", url);
    http.onreadystatechange = function() {//Call a function when the state changes.
            if(http.readyState == 4 && http.status == 200) {
                    //alert(http.responseText);
                print("ok")
            }else{
                print("cannot connect")
                print("code:" + http.status)
                print(http.responseText)
            }
    }
    http.send(null);

I get always "cannot connect" "code" 0 and nothing as response

Any idea?

解决方案

This is going to fail for two reasons:

1) The url "https://www.gmail.com" actually tries to redirect you to "https://mail.google.com/mail/", which in turn will try to redirect you to a login page. This redirect is not being listed as an error

2) However more importantly, you cannot make XMLHttpRequests to a different domain, unless that domain supports CORS (http://www.html5rocks.com/en/tutorials/cors/). GMail does not support CORS, so this request will not work.

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