捕获 javascript XMLHttpRequest 的重定向位置

问题描述

我知道你不能在使用 XMLHttpRequest 时拦截或阻止重定向，因为浏览器会透明地跟随它，但是有可能

I know that you can't, when using an XMLHttpRequest, intercept a redirect or prevent it, as the browser will transparently follow it, but is it possible to either

A.确定请求是否被重定向，或者

A. Determine whether a request redirected, or

B.确定它重定向到的哪里?(假设响应没有给出任何提示)

B. Determine where it redirected to? (assuming that the response gives no hints)

示例代码:

$.post("/my-url-that-redirects/", {}, 
    function(response, statusCode, xmlHttpRequest){
        //Somehow grab the location it redirected to
    }
);

在我的例子中，firebug 将首先显示一个 POST 到 url，然后一个 GET 到重定向的 url.可以捕获该 GET 位置吗?

In my case, firebug will first show a POST to the url, then a GET to the redirected url. Can that GET location be captured?

推荐答案

1) 使用不同于 301 (2**) 的状态码(如果通过 ajax 请求)并在客户端处理重定向:

1) Use different status code than 301 (2**) (if request by ajax) and handle redirection on client side:

var STATUS = {
  REDIRECT: 280
};

$.post('/redirected', {}, function(response, status, request) {
  if (status == STATUS.REDIRECT) {
    // you need to return the redirect url
    location.href = response.redirectUrl;
  } else {
    $('#content').html(request.responseText);
  }
});

2) 不要重定向:

我在重定向模式"中使用它=在发布请求后重定向(您不想让用户刷新发布请求等)

I use that in "redirect pattern" = redirecting after post request (you don't want to allow user to refresh the post request, etc..)

对于 ajax 请求，这不是必需的，所以当发布请求是 ajax 时，我会改为转发(只是转发到不同的控制器 - 取决于您的服务器端框架，或者您正在使用什么......).POST 请求不会被浏览器缓存.

With ajax request, this is not necessary, so when the post request is ajax, I do forward instead (just forward to different controller - depends on your server-side framework, or what you are using...). POST requests are not cached by browsers.

实际上，我不知道你需要它的原因是什么，所以这对你来说可能不是那么有用.这在服务器返回的 ajax 请求与普通请求不同的响应时很有帮助，因为当浏览器重定向 ajax 请求时，重定向的请求不是 XMLHttpRequest...

Actually, I don't know what's the reason you need that, so this might not be so useful for you. This is helpful when server returns different responses for ajax requests than common requests, because when browser redirect ajax request, the redirected request is not XMLHttpRequest...

[更新]

您可以像这样访问(重定向请求的)标头:

You can access headers (of redirected request) like that:

$.post('redirected', {}, function(r, s, req) {
  req.getAllResponseHeaders();
  req.getResponseHeader('Location');
});

应该有'Location'标头，但这取决于服务器，哪些标头被发回......

There should be 'Location' header, but it depends on the server, which headers are sent back...

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