Access to XMLHttpRequest at ‘http://localhost:9600/user/logout‘ from origin ‘http://localhost:9528‘ has been blocked by CORS policy: 
Request header field x-token is not allowed by Access-Control-Allow-Headers in preflight response.

配置如下：

前端：
.env.development：
ENV = ‘development‘
# base api
VUE_APP_BASE_API = ‘http://localhost:9600‘

request.js：
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url // TODO
  withCredentials: true, // send cookies when cross-domain requests
  timeout: 5000 // request timeout
})

user.js

export function login(data) {
  return request({
    headers: {
      ‘Content-Type‘: ‘application/x-www-form-urlencoded‘
    },
    url: ‘/user/login‘,
    method: ‘post‘,
    data: Qs.stringify(data)
  })
}

export function logout() {
  return request({
    url: ‘/user/logout‘,
    method: ‘post‘
  })
}

后端：

package cn.example.project.config;

import cn.example.project.config.sec.*;
import cn.example.project.module.base.Message;
import cn.example.project.module.rbac.Resource;
import cn.example.project.module.rbac.ResourceDB;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.http.HttpMethod;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.security.web.authentication.logout.LogoutSuccessHandler;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.UUID;

@EnableWebSecurity
@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    SecurityUserService securityUserService;
//
    @Autowired
    DynamicallyUrlInterceptor interceptor;

    @Autowired
    UnauthorizedEntryPoint unauthorizedEntryPoint;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(securityUserService).passwordEncoder(new BCryptPasswordEncoder());
    }

    /**
     * https://blog.csdn.net/sinat_33151213/article/details/89931819
     * @param web
     * @throws Exception
     */
    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/index.html", "/static/**", "/login_p", "/favicon.ico");
    }



    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                /*.antMatchers(HttpMethod.OPTIONS,"/**").permitAll()*/
                .antMatchers("/index.html", "/static/**","/static/index.html", "/login_p", "/favicon.ico").permitAll()
                //"/login"不进行权限验证
                .anyRequest().authenticated()   //其他的需要登陆后才能访问
             .and()
                .formLogin()
                //loginProcessingUrl用于指定前后端分离的时候调用后台登录接口的名称
                .loginProcessingUrl("/user/login")
                .usernameParameter("username").passwordParameter("password")
                .successHandler(new AuthenticationSuccessHandler() { //配置登录成功的自定义处理类
                    @Override
                    public void onAuthenticationSuccess(HttpServletRequest req,
                                                        HttpServletResponse resp,
                                                        Authentication auth) throws IOException {
                        Message message = new Message("success", "登录成功!", PermissionUtil.getCurrentUser());
                        //提供给前端 设置cookie
                        message.setToken(UUID.randomUUID().toString());

                        PermissionUtil.handle(req,resp, message);
                    }
                }).failureHandler(new AuthenticationFailureHandler() {
                    @Override
                    public void onAuthenticationFailure(HttpServletRequest req,
                                                        HttpServletResponse resp,
                                                        AuthenticationException e) throws IOException {
                        Message message = null;
                        if (e instanceof BadCredentialsException ||
                                e instanceof UsernameNotFoundException) {
                            message = new Message("error", "账户名或者密码输入错误!", e.getMessage());
                        } else {
                            message = new Message("error", "登录失败!", e.getMessage());
                        }
                        PermissionUtil.handle(req,resp, message);
                    }
                })
                .and()
                    .logout().logoutUrl("/user/logout")//logoutUrl用于指定前后端分离的时候调用后台注销接口的名称
                        .logoutSuccessHandler(new LogoutSuccessHandler() {
                            @Override
                            public void onLogoutSuccess(HttpServletRequest req, HttpServletResponse resp, Authentication authentication) throws IOException, ServletException {

                                Message message = new Message("success", "注销成功!", null);
                                PermissionUtil.handle(req,resp, message);
                            }
                    })
                .and().exceptionHandling().authenticationEntryPoint(unauthorizedEntryPoint)// 配置没有权限的自定义处理类
                .and()
                 .cors().disable().csrf().disable(); // 取消跨站请求伪造防护

        http.addFilterBefore(interceptor, FilterSecurityInterceptor.class);
    }
}


package cn.example.project.config;

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
import org.springframework.web.servlet.config.annotation.*;

/**
 * 配置允许跨域  localhost:9900/aa 登录 localhost:9900/bb 也认可登录
 */
@Configuration
public class WebMvcConfg  implements  WebMvcConfigurer {
    /**
     * 配置静态资源
     * https://blog.csdn.net/sinat_33151213/article/details/89931819
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("/public/**").addResourceLocations("classpath:/public/");
    }

//    @Override
//    public void addCorsMappings(CorsRegistry registry) {
//        registry.addMapping("/**")
//                .allowCredentials(true)
//                .allowedHeaders("*")
//                .allowedOrigins("*")
//                .allowedMethods("*");
//
//    }
//
//    private CorsConfiguration corsConfig() {
//        CorsConfiguration corsConfiguration = new CorsConfiguration();
//        /*
//        * 请求常用的三种配置，*代表允许所有，当时你也可以自定义属性（比如header只能带什么，只能是post方式等等）
//        */
//        corsConfiguration.addAllowedOrigin("*");
//        corsConfiguration.addAllowedHeader("*");
//        corsConfiguration.addAllowedMethod("*");
//        corsConfiguration.setAllowCredentials(true);
//        corsConfiguration.setMaxAge(3600L);
//        return corsConfiguration;
//    }
//    @Bean
//    public CorsFilter corsFilter() {
//        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
//        source.registerCorsConfiguration("/**", corsConfig());
//        return new CorsFilter(source);
//    }


//    @Override
//    public void addCorsMappings(CorsRegistry registry) {
//        registry.addMapping("/**")
//                .allowedOrigins("*")
//                .allowedMethods("PUT", "DELETE","GET","POST")
//                .allowedHeaders("*")
//                .exposedHeaders("access-control-allow-headers",
//                        "access-control-allow-methods",
//                        "access-control-allow-origin",
//                        "access-control-max-age",
//                        "X-Frame-Options")
//                .allowCredentials(true).maxAge(36000);
//
//    }
//
//    @Bean
//    public CorsFilter corsFilter() {
//        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
//        final CorsConfiguration config = new CorsConfiguration();
//        config.setAllowCredentials(true);
//        config.addAllowedOrigin("*");
//        config.addAllowedHeader("*");
//        config.addAllowedMethod("OPTIONS");
//        config.addAllowedMethod("HEAD");
//        config.addAllowedMethod("GET");
//        config.addAllowedMethod("PUT");
//        config.addAllowedMethod("POST");
//        config.addAllowedMethod("DELETE");
//        config.addAllowedMethod("PATCH");
//        source.registerCorsConfiguration("/**", config);
//        final CorsFilter bean = new CorsFilter(source);
//        return bean;
//    }


//------------加了拦截器，所以需要用如下的cors 才生效。-----------------------------
    /**
     *
     * @param registry
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        //设置允许跨域的路径
        registry.addMapping("/**")
                //设置允许跨域请求的域名
                .allowedOrigins("*")
                //是否允许证书 不再默认开启
                .allowCredentials(true)
                //设置允许的方法
                .allowedMethods("*")
                //跨域允许时间
                .maxAge(3600);
    }
    @Bean
    public FilterRegistrationBean corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        source.registerCorsConfiguration("/**", config);
        FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
        bean.setOrder(0);
        return bean;
    }
}


我开始请求登录：

登录成功后的cookie,

http://localhost:9528/#/login  提供登录页面。
登录到
http://localhost:9600/user/login
登录成功后cookie保存到浏览器，下次请求
http://localhost:9600 后端服务，携带cookie表示登录过的用户在请求资源。

但是当我退出时：http://localhost:9600/user/logout
Access to XMLHttpRequest at ‘http://localhost:9600/user/logout‘ from origin ‘http://localhost:9528‘ has been blocked by CORS policy:
 Request header field x-token is not allowed by Access-Control-Allow-Headers in preflight response.

找了好多种方法很痛苦，为了一句承诺：用户角色权限管理模板半天就出来了。我写了两个月了。我还没有写完。现在还在写登录。（太傻，太天真）

解决 axios 跨域时，发送 post 请求变 options 的问题

确实我发的是post ,但是变为post.

大意是说有options预请求，在发实际请求。

最后在 
https://stackoverflow.com/questions/36705874/request-options-logout-doesnt-match-post-logout
找到一个回答：

我的代码修改为允许所有options请求：
 http.authorizeRequests()
                .antMatchers(HttpMethod.OPTIONS,"/**").permitAll()

最后logout成功