SpringBoot 实现跨域请求

╰半橙微兮° 2022-05-25 06:47 264阅读 0赞

# 跨域访问支持（Spring Boot、Nginx、浏览器） #

## 一、Spring Boot跨域配置 ##

我们的后端使用Spring Boot。Spring Boot跨域非常简单，只需书写以下代码即可。

@Configuration
    public class CustomCORSConfiguration {
      private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        return corsConfiguration;
      }
      @Bean
      public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
      }
    }

代码非常简单，不做赘述。该代码在Spring Boot 1.5.4中测试通过。

## 二、Nginx跨域配置 ##

某天，我们将Spring Boot应用用Nginx反向代理。而前端跨域请求的需求不减，于是乎。

Nginx跨域也比较简单，只需添加以下配置即可。

location / {
    	proxy_pass http://localhost:8080;
    	if ($request_method = 'OPTIONS') {
    		add_header 'Access-Control-Allow-Origin' '*';
    		add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    		add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';
    		add_header 'Access-Control-Max-Age' 1728000;
    		add_header 'Content-Type' 'text/plain; charset=utf-8';
    		add_header 'Content-Length' 0;
    		return 204;
    	}
    	if ($request_method = 'POST') {
    		add_header 'Access-Control-Allow-Origin' '*';
    		add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    		add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';
    		add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';
    	}
    	if ($request_method = 'GET') {
    		add_header 'Access-Control-Allow-Origin' '*';
    		add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    		add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';
    		add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';
    	}
    }

其中：`add_header 'Access-Control-Expose-Headers'` 务必加上你请求时所带的header。例如本例中的“Token”，其实是前端传给后端过来的。如果记不得也没有关系，浏览器的调试器会有详细说明。

参考文档：[https://enable-cors.org/server\_nginx.html][https_enable-cors.org_server_nginx.html]

B.T.W，阿里云中文档描述到Nginx也可通过crossdomain.xml配置文件跨域：[https://helpcdn.aliyun.com/knowledge\_detail/41123.html][https_helpcdn.aliyun.com_knowledge_detail_41123.html] ，不过笔者并未采用这种方式。

## 三、浏览器设置跨域 ##

Chrome、Firefox本身是可以通过配置支持跨域请求的。

*  Chrome跨域：参考文档：[http://www.cnblogs.com/laden666666/p/5544572.html][http_www.cnblogs.com_laden666666_p_5544572.html]
 *  Firefox跨域：参考文档：[https://segmentfault.com/q/1010000002532581/a-1020000002533699][https_segmentfault.com_q_1010000002532581_a-1020000002533699]

注：通过浏览器设置实现跨域的玩法，个人没有亲测过。

转载自：http://www.itmuch.com/work/cors/

[https_enable-cors.org_server_nginx.html]: https://enable-cors.org/server_nginx.html
[https_helpcdn.aliyun.com_knowledge_detail_41123.html]: https://helpcdn.aliyun.com/knowledge_detail/41123.html
[http_www.cnblogs.com_laden666666_p_5544572.html]: http://www.cnblogs.com/laden666666/p/5544572.html
[https_segmentfault.com_q_1010000002532581_a-1020000002533699]: https://segmentfault.com/q/1010000002532581/a-1020000002533699