使用 CORS 过滤器的跨源请求

Question

我正在尝试从 AngularJS 1.3 应用向 REST 服务发出跨源请求。虽然我启用了 CORS 过滤器，但我收到了 403 Forbidden 响应。这是请求（从 chrome 开发工具复制粘贴）。在 IE 9 上它似乎工作。我在 Chrome 和 Firefox 上收到 403 错误代码。

Remote Address:127.0.0.1:8080
Request URL:http://localhost:8080/<path>
Request Method:OPTIONS
Status Code:403 Forbidden
Request Headersview source
Accept:*/*
Accept-Encoding:gzip, deflate, sdch
Accept-Language:en,ro;q=0.8,en-US;q=0.6,en-GB;q=0.4
Access-Control-Request-Headers:x-auth-token, content-type
Access-Control-Request-Method:POST
Connection:keep-alive
Host:localhost:8080
Origin:http://localhost:9000
Referer:http://localhost:9000/
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, ike Gecko) Chrome/40.0.2214.111 Safari/537.36
Response Headersview source
Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:Origin, Accept, x-auth-token, Content-Type,        
Access-Control-Request-Method, Access-Control-Request-Headers
Access-Control-Allow-Methods:POST, GET, HEAD, OPTIONS
Access-Control-Allow-Origin:http://localhost:9000
Content-Length:0
Content-Type:text/plain
Date:Tue, 17 Feb 2015 07:11:24 GMT
Server:Apache-Coyote/1.1

URL 没问题。如果我直接将它粘贴到浏览器中，它就可以工作了。

跨源身份验证有效：

Remote Address:127.0.0.1:8080
Request        
URL:http://localhost:8080/<serviceName>/webapi/authentication/authenticate
Request Method:POST
Status Code:200 OK
Request Headersview source
Accept:*/*
Accept-Encoding:gzip, deflate
Accept-Language:en,ro;q=0.8,en-US;q=0.6,en-GB;q=0.4
Connection:keep-alive
Content-Length:42
Content-Type:application/json;charset=UTF-8
Host:localhost:8080
Origin:http://localhost:9000
Referer:http://localhost:9000/
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML,     like Gecko) Chrome/40.0.2214.111 Safari/537.36
Request Payload
{username: "user", password: "pass"}
Response Headersview source
Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:http://localhost:9000
Content-Length:100
Content-Type:application/json
Date:Tue, 17 Feb 2015 07:11:24 GMT
Server:Apache-Coyote/1.1
Set-Cookie:JSESSIONID=805B2490C0BA258D7D0FF4235BA49B76; Path=/<appcontext>/;     
HttpOnly

我正在使用 Spring 安全性进行身份验证。跨源请求还需要什么？

使用的 CORS 过滤器：

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;

public class CORSFilter2 implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse     servletResponse, FilterChain filterChain) throws IOException, ServletException {
        final HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setHeader("Access-Control-Allow-Origin", "http://localhost:9000");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, HEAD, OPTIONS");
        response.setHeader("Access-Control-Allow-Headers", "Origin, Accept, x-auth-token, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {

    }

}

Answer 1

通过 CORS 非 GET 请求自动在浏览器中发送预检请求。您应该在 HTTP 服务器上允许 OPTIONS 方法，并在 CORS 中允许 headers 来处理这些请求。您的服务器应该响应 CORS allow headers 和 200 ok 对 preflights 的空响应 body。

根据您的评论，问题可能是由您的自定义 x-auth-token header 引起的，它不是由 OPTIONS 请求发送的，因此您的服务器响应 403 forbidden.

A preflight call is a call to determine if an action is allowed. It should not require credentials to determine if I can do something, it should only require credentials to actually do it.

CORS preflight issues in Firefox and Chrome

我同意 Ryan 的观点，你不应该通过选项检查身份验证 headers。

Answer 2

对于预检 CORS 请求，您需要注意 OPTIONS 请求中不会发送凭据。如果后者在其响应中发回正确的 CORS headers，则使用凭据调用目标请求。这就是为什么你有 403 状态码...

所以你需要调整你的 CORS 过滤器，不要尝试验证这个 OPTIONS 请求。

除了前面的答案，这个 link 可以帮助您解决问题：https://templth.wordpress.com/2014/11/12/understanding-and-using-cors/。

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