尽管标头正确，但 CORS Access-Control-Allow-Origin

问题描述

我正在尝试在客户端上使用 jQuery (1.7.1) 驱动的 ajax 和 apache 服务的 python (django) 服务器来设置简单的跨域资源共享.根据我已阅读的所有说明，我的标题设置正确，但我不断收到以下错误:

I am trying to set up simple Cross-Origin Resource Sharing using jQuery (1.7.1) powered ajax on the client and apache served python (django) server. According to all the instructions I have read my headers are set correctly, but I keep getting the following error:

XMLHttpRequest 无法加载 http://myexternaldomain.com/get_data.来源 http://localhost:8080 不允许访问控制允许来源.

XMLHttpRequest cannot load http://myexternaldomain.com/get_data. Origin http://localhost:8080 is not allowed by Access-Control-Allow-Origin.

我正在尝试发送的标题(我不确定它是否能通过浏览器)发送是:

The header being I am trying to (I am not sure it is even getting past the browser) send is:

Request URL:http://myexternaldomain.com/get_data
Accept:application/json, text/javascript, */*; q=0.01
Origin:http://localhost:8080
Referer:http://localhost:8080/static/js/test-zetta.html
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.66 Safari/535.11

javascript代码是

The javascript code is

    var request = $.ajax({
        url : "http://myexternaldomain.com/get_data",
        type : "POST",
        dataType : "json",
        crossDomain : true
    });

请注意，origin 设置正确.服务器使用以下python代码添加标头Access-Control-Allow-Origin = *

Note that origin is set correctly. The server adds the header Access-Control-Allow-Origin = * using the following python code

def process_response(self, response):
    if response.has_header('Access-Control-Allow-Origin'):
            return response

    response['Access-Control-Allow-Origin'] = '*'
    return response

def get_orders(request):
    """ Tell worker what to do """
    response_data = {}
    response_data['action'] = 'probe'
    response = process_response(HttpResponse(json.dumps(response_data), mimetype="application/json"))
    return response

如果我直接访问该地址，似乎可以确认标题设置正确

If I visit the address directly, it appears to confirm that the header is being set correctly

Access-Control-Allow-Origin:*
Content-Type:application/json
Date:Thu, 08 Mar 2012 05:06:25 GMT
Server:Apache/2.2.20 (Ubuntu)
Transfer-Encoding:chunked

但是在跨域设置中它总是失败(尝试了 chrome 和 firefox).我已经尝试完全按照 this 问题，但得到同样的错误

However in the cross domain setting it always fails (tried both chrome and firefox). I've tried implementing the code exactly as per the selected answer to this question, but get the same error

更新

我很确定问题出在服务器端，因为我已经设法让我的 ajax 调用与另一个启用了 CORS 的公共服务器一起工作.当我比较从这个公共服务器返回的标头和从我返回的标头(当我从同一个域进行测试时)时，我看不到任何可能导致差异的主要差异(见下文).

I am quite sure that the problem is server side, as I have managed to get my ajax calls working with a different public CORS enabled server. When I compare the headers coming back from this public server, and the ones returned from mine (when I test from same domain), I cannot see any major difference which could account for difference (see below).

我排除的一个微妙之处可能很重要，也可能很重要，那就是实际域是多个子域的亚马逊域.真实地址是http://ec2-23-20-27-108.compute-1.amazonaws.com/get_orders，请随意探索一下，看看我做错了什么.

One subtlety that I excluded, which may or may be important is that the actual domain is an amazon domain of multiple subdomains. The real address is http://ec2-23-20-27-108.compute-1.amazonaws.com/get_orders , feel free to probe it to see what I am doing wrong.

来自公共服务器

Access-Control-Allow-Origin:*
Connection:Keep-Alive
Content-Encoding:gzip
Content-Length:622
Content-Type:text/html
Date:Thu, 08 Mar 2012 15:33:20 GMT
Keep-Alive:timeout=15, max=99
Server:Apache/2.2.14 (Ubuntu)
Vary:Accept-Encoding
X-Powered-By:Perl/5.8.7, PHP/4.4.0

来自我的服务器 - (不能跨域工作)

Access-Control-Allow-Origin:*
Content-Encoding:gzip
Content-Type:text/plain
Date:Thu, 08 Mar 2012 15:32:24 GMT
Server:Apache/2.2.20 (Ubuntu)
Transfer-Encoding:chunked
Vary:Accept-Encoding

推荐答案

所以我被转到 URL 的响应误导了，实际上问题是在执行 ajax 请求时，我得到了 403 (由于 csrf 保护，仅在 firefox 而非 chrome 中显示)错误.

So I was being mislead by the response from going to the URL, and in fact the problem was that when doing the ajax request, I was getting a 403 (only revealed in firefox not chrome) error due to csrf protection.

这篇关于尽管标头正确，但 CORS Access-Control-Allow-Origin的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！