在Angular 2的http.post中添加任何选项或头部会发送OPTIONS请求。

我试图通过http.post()将令牌信息发送回服务器。如果我从中删除选项，它会发送一个POST请求，但是如果我把它们添加回去，它会发送一个OPTIONS请求，服务器代码会拒绝。我也尝试删除\"withCredentials\"选项。\n我的身份验证服务如下：\n

import { Injectable, Inject } from '@angular/core';
import { Http, Headers, Response } from '@angular/http';
import { Observable } from 'rxjs';
import 'rxjs/add/operator/map'
@Injectable()
export class AuthenticationService {
    public token: string;
    constructor(@Inject(Http) private http: Http) {
        // 如果本地存储中有保存的令牌，则设置令牌
        var currentUser = JSON.parse(localStorage.getItem('currentUser'));
        this.token = currentUser && currentUser.token;
    }
    login(username: string, password: string): Observable {;
        console.log("login...");
        return this.http.post('http://localhost:8080/api/auth/login', JSON.stringify({ username: username, password: password }))
            .map((response: Response) => {
                // 如果响应中有jwt令牌，则登录成功
                let token = response.json() && response.json().token;
                if (token) {
                    // 设置令牌属性
                    this.token = token;
                    // 将用户名和jwt令牌存储在本地存储中，以便在页面刷新之间保持用户登录状态
                    localStorage.setItem('currentUser', JSON.stringify({ username: username, token: token }));
                    // 返回true表示登录成功
                    return true;
                } else {
                    // 返回false表示登录失败
                    return false;
                }
            });
    }
    logout(): void {
        // 清除令牌，并从本地存储中移除用户以登出
        this.token = null;
        localStorage.removeItem('currentUser');
    }
}

\n这是我的Spring配置：\n

@SpringBootApplication
public class SpringBootApp extends WebMvcConfigurerAdapter {
    private boolean workOffline = true;
    private boolean setupSchema = false;
    private IGraphService graphService;
    private DbC conf;
    @Autowired
    public SpringBootApp(IGraphService graphService, DbC conf)
    {
        this.graphService = graphService;
        this.conf = conf;
    }
    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootApp.class, args);
    }
    @Bean
    public Filter caseInsensitiveRequestFilter() {
        return new CaseInsensitiveRequestFilter();
    }
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("http://localhost:3000")
                .allowedMethods("GET", "PUT", "POST", "DELETE","OPTIONS");
    }
    @Bean
    public FilterRegistrationBean corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        config.addAllowedOrigin("http://localhost:3000");
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        source.registerCorsConfiguration("/**", config);
        FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
        bean.setOrder(0);
        return bean;
    }
}

\n我真的不知道该怎么办，因为我遵循了Angular2 OPTIONS method sent when asking for http.GET中所说的，并且这不是预检请求。我之前遇到过与错误的内容类型相关的问题。