Spring Security与Vue开发时，如果只是vue设置代理，会报CORS错误。需要前端和后台一起设置

1、前端

设置代理 

const { defineConfig } = require('@vue/cli-service')
 
module.exports = defineConfig({
  transpileDependencies: true,
  devServer: {
    host: 'localhost',
    port: 8081,
    proxy: {
      '/' : {
        target: 'http://localhost:8080',
        changeOrigin: true,
        ws: false
      }
    }
  }
})

2、后台

Spring Security设置支持跨域访问 

@Override
	protected void configure(HttpSecurity http) throws Exception {
		http.cors().configurationSource(corsConfigurationSource()).and().csrf().
		disable().addFilterAt(loginFilter(), UsernamePasswordAuthenticationFilter.class);
	}
	
	CorsConfigurationSource corsConfigurationSource() {
        // 提供CorsConfiguration实例，并配置跨域信息
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.setAllowedHeaders(Arrays.asList("*"));
        corsConfiguration.setAllowedMethods(Arrays.asList("*"));
        corsConfiguration.setAllowedOrigins(Arrays.asList("http://localhost:8081"));
        corsConfiguration.setMaxAge(3600L);
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", corsConfiguration);
        return source;
    }