不允许多个 CORS 标头“Access-Control-Allow-Origin”/缺少 CORS 标头“Access-Control-Allow-Origin”）

Question

当我从 Angular 7 应用程序（托管在http://localhost:4200 上）向我的 Spring-Boot 应用程序（托管在https://localhost:8924 上）从 Firefox 发送 HTTP 请求时，我遇到了 CORS 标头问题。

我的 Spring-Boot 应用程序中有一个 CORS 过滤器，它已添加到我的请求中：

@Component
public class CorsFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(final HttpServletRequest request, final HttpServletResponse response,
                                    final FilterChain filterChain) throws ServletException, IOException {
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT, PATCH, HEAD");
        response.setHeader("Access-Control-Allow-Headers", "X-Requested-With, Authorization, Content-Type");
        response.addIntHeader("Access-Control-Max-Age", 3600);

        if ("OPTIONS".equalsIgnoreCase(request.getMethod())) 
        {
            response.setStatus(HttpServletResponse.SC_OK);
        } 
        else 
        {
            filterChain.doFilter(request, response);
        }
    }
}

    @Override
    protected void configure(HttpSecurity http) throws Exception 
    {
        http.addFilterBefore(corsFilter(), SessionManagementFilter.class);
        http.csrf().disable().
            authorizeRequests()
                .antMatchers("/api/auth/**","/api/MentorCalendar","/api/user/role/**").permitAll()
                .anyRequest().authenticated()
                .and()
                .exceptionHandling().authenticationEntryPoint(unauthorizedHandler).and()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);

        http.addFilterBefore(authenticationJwtTokenFilter(), UsernamePasswordAuthenticationFilter.class);
    }

发送请求时，Firefox 控制台返回此错误消息：

跨域请求被阻止：同源策略不允许读取位于http://localhost:8924/api/auth/signin的远程资源。 （原因：不允许多个 CORS 标头“Access-Control-Allow-Origin”）。

注释掉 Access-Control-Allow-Origin：

@Component
public class CorsFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(final HttpServletRequest request, final HttpServletResponse response,
                                    final FilterChain filterChain) throws ServletException, IOException {
//        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT, PATCH, HEAD");
        response.setHeader("Access-Control-Allow-Headers", "X-Requested-With, Authorization, Content-Type");
        response.addIntHeader("Access-Control-Max-Age", 3600);

        if ("OPTIONS".equalsIgnoreCase(request.getMethod())) 
        {
            response.setStatus(HttpServletResponse.SC_OK);
        } 
        else 
        {
            filterChain.doFilter(request, response);
        }
    }
}

返回此错误消息：

跨域请求被阻止：同源策略不允许读取位于http://localhost:8924/api/auth/signin的远程资源。 （原因：缺少 CORS 标头“Access-Control-Allow-Origin”）。

src/app/home/login.component.ts 提取

export class LoginComponent {
  constructor(private LoginService: LoginService, private router: Router) {}

  login(inputUsername, inputPassword){
    this.LoginService.login({username: inputUsername, password: inputPassword})
        .subscribe(data => {
        localStorage.setItem("jwtToken", data.accessToken);

src/app/home/login.service.ts

const httpOptions = {
  headers: new HttpHeaders({
    'Content-Type':  'application/json'
  })
};

@Injectable()
export class LoginService {
  loginUrl = "http://localhost:8924/api/auth/signin";

  constructor( private http: HttpClient ) {}

  login(loginCreds: any): Observable<any> {
  return this.http.post<any>(this.loginUrl, loginCreds, httpOptions);
  }
}

response.addHeader("Access-Control-Allow-Origin", "*"); 行在包含时设置多个标题，但在删除时没有设置？

Answer 1

您是否尝试在 springboot 控制器中启用@CrossOrigin() 。 下面是基本片段。

@CrossOrigin(origins = "http://localhost:9000")
@GetMapping("/greeting")
public Greeting greeting(@RequestParam(required=false, defaultValue="World") String name) {
    System.out.println("==== in greeting ====");
    return new Greeting(counter.incrementAndGet(), String.format(template, name));
}

有关更多信息，请访问启用 CORS

我有同样的问题。 通过上面的解决方法解决了。 您在使用 Internet Explorer 时一定不是 CORS 问题。

Answer 2

这为我解决了这个问题：

if(!response.containsHeader("Access-Control-Allow-Origin"))
{
    response.addHeader("Access-Control-Allow-Origin", "*"); 
}

不是让它工作的理想方式

Answer 3

在我的情况下，当我在 nginx conf 文件和 Django 中间件中设置 CORS 支持时会发生这种情况。

Nginx部分：

if ($request_method = 'OPTIONS') {
    add_header 'Access-Control-Allow-Origin' '*';
    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
    add_header 'Access-Control-Max-Age' 1728000;
    add_header 'Content-Type' 'text/plain; charset=utf-8';
    add_header 'Content-Length' 0;
    return 204;
}
if ($request_method = 'POST') {
    add_header 'Access-Control-Allow-Origin' '*';
    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
    add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
}
if ($request_method = 'GET') {
    add_header 'Access-Control-Allow-Origin' '*';
    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
    add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
}    

姜戈部分：

MIDDLEWARE = (
    'corsheaders.middleware.CorsMiddleware',

解决方案非常简单 - 我只是删除了 nginx 中的 CORS 部分并且一切正常

location / {
    uwsgi_pass  django_upstream;
    include     uwsgi_params;
}