捕获javascript XMLHttpRequest的重定向位置 [英] Capture redirect location of javascript XMLHttpRequest

问题描述

我知道在使用XMLHttpRequest时，你不能拦截重定向或阻止重定向，因为浏览器会透明地遵循它，但是可以

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

一个。确定重定向的请求，或

A. Determine whether a request redirected, or

B.确定重定向到哪里？ （假设响应没有提示）

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
    }
);

在我的情况下，firebug将首先向网址显示POST，然后向重定向网址显示GET 。是否可以捕获GET位置？

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）使用与301（2 **）不同的状态代码（如果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（您不希望允许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..)

使用ajax请求，这不是必需的，所以当post请求是ajax时，我会转发（只转发到不同的控制器 - 取决于你的服务器端框架，或者你正在使用的......）。浏览器不会缓存POST请求。

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，我不知道你需要什么原因，所以这对你来说可能没那么有用。当服务器为ajax请求返回不同于常见请求的响应时，这很有用，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...

[已更新]

您可以访问（重定向请求）标题：

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

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

应该有'Location'标题，但它取决于服务器，哪些标题被发回。 ..

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

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