java - 将本地 React 前端连接到本地 Spring Boot 中间件应用程序时出现 CORS 错误

Question

我正在使用 React 开发一个前端应用程序，它连接到一个用 Spring boot 编写的中间件服务。我正在尝试从前端调用端点，如下所示:

return axios.post('http://localhost:8085/workshop/client/createClient', {username})
.then((response) => {
  console.log('Success')
})
.catch((error) => console.log(error));

每当我在浏览器中发出请求时，我都会收到以下错误:

OPTIONS http://localhost:8085/workshop/client/createClient 401 ()

Failed to load http://localhost:8085/workshop/client/createClient: Response for preflight has invalid HTTP status code 401.

据我了解，这是因为预检请求被我的中间件应用程序阻止了。在网上阅读了一些有关启用此功能的内容后，我在我的 spring boot 应用程序中添加了一个 CorsFilter:

@Slf4j
public class CORSFilter implements Filter {
  private static final String ONE_HOUR = "3600";

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

  @Override
  public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
    HttpServletResponse response = (HttpServletResponse) res;
    response.setHeader("Access-Control-Allow-Origin", "*");
    response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", ONE_HOUR);
    response.setHeader("Access-Control-Allow-Headers", "X-Requested-With,Origin,Content-Type, Accept, x-device-user-agent, Content-Type");

    if (req instanceof HttpServletRequest) {
       HttpServletRequest httpServletRequest = (HttpServletRequest) req;
       if (httpServletRequest.getHeader(HttpHeaders.ORIGIN) != null
          && httpServletRequest.getMethod().equals(HttpMethod.OPTIONS.name())
          && httpServletRequest.getHeader(HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD) != null) {
          log.debug("Received an OPTIONS pre-flight request.");
          return;
       }
    }
    chain.doFilter(req, res);
  }

  @Override
  public void destroy() {
  }
}

和

@Configuration
public class MvcConfiguration {

 @Bean
 public FilterRegistrationBean corsFilter() {
   FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
   filterRegistrationBean.setFilter(new CORSFilter());
   filterRegistrationBean.addUrlPatterns("/*");
   filterRegistrationBean.setOrder(0);
   return filterRegistrationBean;
 }
}

这是端点的示例:

 @PostMapping("/createClient")
 public ResponseEntity<?> createClient(@RequestBody CreateClientDto clientDto) {
    try {
     ...
     return new ResponseEntity<>(responseBody, OK);
    } catch (Exception e ...) {}
  }

任何帮助将不胜感激:)

更新:我的请求 url 略有错误(因此是 404)。我已经更新了错误消息。我似乎仍有 CORS 问题。

这些是我可以在开发工具中看到的响应 header :

Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:access-control-allow-credentials, access-control-allow-methods, access-control-allow-origin, allow, content-type
Access-Control-Allow-Methods:POST
Access-Control-Allow-Origin:http://localhost:3000
Allow:GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH
Cache-Control:no-cache, no-store, max-age=0, must-revalidate
Content-Length:0
Date:Thu, 01 Mar 2018 14:06:38 GMT
Expires:0
Pragma:no-cache
Strict-Transport-Security:max-age=31536000 ; includeSubDomains
Vary:Origin
WWW-Authenticate:Basic realm="Spring"
X-Content-Type-Options:nosniff
X-Frame-Options:DENY
X-XSS-Protection:1; mode=block

以及请求 header :

OPTIONS /workshop/client/createClient HTTP/1.1
Host: localhost:8085
Connection: keep-alive
Access-Control-Request-Method: POST
Origin: http://localhost:3000
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) 
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36
Access-Control-Request-Headers: access-control-allow-credentials,access-control-allow-methods,access-control-allow-origin,allow,content-type
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: en-GB,en;q=0.9,en-US;q=0.8,da;q=0.7

Answer 1

我也有这个问题，但请允许我以更简单的交流方式给出一个直接的答案。

首先，您必须告诉您的服务器(Spring boot java)关于客户端(Reactjs)URL。

例如，大多数时候 spring boot 使用 http://localhost:8080 而 Reactjs 使用 http://localhost:3000。

因此，您必须在 Spring boot java 中导航到 Controller ，并允许 Reactjs 的 URL 获得服务器(Spring boot)中的可访问性权限。这将帮助您摆脱 CORS 问题。

我们如何在 Spring boot 中执行此操作？只需添加 @CrossOrigin 注释指定 Reactjs URL 链接，如下所示:

例如:

    @GetMapping("/orphans")
    @CrossOrigin(origins = "http://localhost:3000")
    Iterable<Student> read() {
        return studentService.findAll();
    }

上面的方法是列出所有孤儿，所以我给了 Reactjs URL 链接权限，然后我摆脱了 CORS 问题。

快乐编码。