javascript - CORS 策略阻止 localhost

Question

我使用 Spring Boot 2 和 REST API 制作了一些 Web 项目。我有两个项目，一个是rest API，另一个是调用rest API的Web项目。我已经在使用 @CrossOrigin(origins = "*")。所以，它在 Controller 类中运行良好。

但是，当我向其他 Controller 类调用请求时，chrome 将其打印给我，从源“http://localhost:8081”访问“http://localhost:8080/signout/1234”处的 XMLHttpRequest ' 已被 CORS 策略阻止:对预检请求的响应未通过访问控制检查:它没有 HTTP 正常状态。。我该如何解决这个问题？

这是我的工作 Controller 类。盲区没有其他特别之处:

@CrossOrigin(origins = "*")
@RestController
@RequestMapping("/admin")
public class AdminController {
...
@PutMapping("/users")
public User updateUser(@Valid @RequestBody User updatedUser) throws ResourceNotFoundException {
        User savedUser = userRepository.findByUsername(updatedUser.getUsername());
        savedUser.setPassword(updatedUser.getPassword());
        savedUser = userRepository.save(savedUser);
        return savedUser;
    }
...
}

这是工作ajax:

var xmlHttp = new XMLHttpRequest();
xmlHttp.onreadystatechange = function() {
       if (this.readyState == 4 && this.status == 200){
            ...
        } else if (this.status == 500) {
            alert(this.responseText);
        }
    }

    var json = JSON.stringify(param);
    xmlHttp.open("POST", mainurl+"admin/role", false);
    xmlHttp.setRequestHeader("Content-type", "application/json; charset=utf-8");
    xmlHttp.send(json);

这不是工作 Controller 。起初我只是使用`@CrossOrigin(origins = "*")。

//@CrossOrigin(origins = "http://localhost:8081", allowedHeaders = "*")
@CrossOrigin(origins = "*", allowCredentials = "true", methods = {RequestMethod.GET, RequestMethod.POST, RequestMethod.PUT, RequestMethod.DELETE})
@RestController
@RequestMapping("/")
public class UserController {
...
}

这不适用于 JWT 的 ajax。

$.ajax({
        type: "DELETE", 
        url: "http://localhost:8080/signout/"+username,
        async: true,
//      crossDomain: true,
        beforeSend: function (xhr) {
            xhr.setRequestHeader("Authorization", 'Bearer '+ "${token}");
        },
        success: function(result, status, xhr){
            //service 표시
        },
        error: function(xhr, status, err) {
            alert(xhr.responseText);
        }
    });

//      var xmlHttp = new XMLHttpRequest();
//      xmlHttp.onreadystatechange = function() {
//          if (this.readyState == 4 && this.status == 200){
//              location.href=window.location.protocol + "//" + window.location.host + "/sso_ui/";
//          } else if (this.status == 500) {
//              alert(this.responseText);
//          }
//      }

//      xmlHttp.open("DELETE", "http://localhost:8080/signout/"+username, false);
//      xmlHttp.setRequestHeader("Content-type", "application/json; charset=utf-8");
//      xmlHttp.setRequestHeader('Authorization', 'Bearer ' + "${token}");
//      xmlHttp.send();

如何解决这个问题？

Answer 1

选项 1: 添加 RequestMethod.OPTIONS

 @CrossOrigin(origins = "*", allowCredentials = "true", methods = {RequestMethod.OPTIONS, RequestMethod.GET, RequestMethod.POST, RequestMethod.PUT, RequestMethod.DELETE})

为什么选择选项？

此飞行前请求 (RequestMethod.OPTIONS) 是由某些浏览器作为安全措施发出的，以确保正在执行的请求受到服务器的信任。这意味着服务器知道根据请求发送的方法、来源和 header 可以安全地执行操作。

<小时/>

选项 2:CORS 的 WebConfig

您可以为 CORS 源配置创建一个 WebConfig 类，这样我们就不需要在每个 Controller 上编写 @CrossOrigin。

WebConfig.java

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
@EnableWebMvc
public class WebConfig implements Filter,WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**");
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) {
      HttpServletResponse response = (HttpServletResponse) res;
      HttpServletRequest request = (HttpServletRequest) req;
      System.out.println("WebConfig; "+request.getRequestURI());
      response.setHeader("Access-Control-Allow-Origin", "*");
      response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");
      response.setHeader("Access-Control-Allow-Headers", "Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With,observe");
      response.setHeader("Access-Control-Max-Age", "3600");
      response.setHeader("Access-Control-Allow-Credentials", "true");
      response.setHeader("Access-Control-Expose-Headers", "Authorization");
      response.addHeader("Access-Control-Expose-Headers", "USERID");
      response.addHeader("Access-Control-Expose-Headers", "ROLE");
      response.addHeader("Access-Control-Expose-Headers", "responseType");
      response.addHeader("Access-Control-Expose-Headers", "observe");
      System.out.println("Request Method: "+request.getMethod());
      if (!(request.getMethod().equalsIgnoreCase("OPTIONS"))) {
          try {
              chain.doFilter(req, res);
          } catch(Exception e) {
              e.printStackTrace();
          }
      } else {
          System.out.println("Pre-flight");
          response.setHeader("Access-Control-Allow-Origin", "*");
          response.setHeader("Access-Control-Allow-Methods", "POST,GET,DELETE,PUT");
          response.setHeader("Access-Control-Max-Age", "3600");
          response.setHeader("Access-Control-Allow-Headers", "Access-Control-Expose-Headers"+"Authorization, content-type," +
          "USERID"+"ROLE"+
                  "access-control-request-headers,access-control-request-method,accept,origin,authorization,x-requested-with,responseType,observe");
          response.setStatus(HttpServletResponse.SC_OK);
      }

    }

}