What are the cross-domain solutions for SpringBoot projects?

Test whether it is cross-domain

You can open the console of a page in the browser, and then execute the following code in the console:

var xhr = new XMLHttpRequest()
xhr.open('GET', 'http://localhost:8080/user') // 替换请求的方法和地址
xhr.send()
xhr.onreadystatechange = function() {
    if (xhr.readyState == 4 && xhr.status == 200) {
        console.log(xhr.responseText)
    }
}

If the following output appears, It means that there is indeed cross-domain

1. SpringBoot configures CORS to solve cross-domain

That is, in all our response header configurations to allow cross-domain access, CORS has also become Mainstream cross-domain solution.

• Create a new configuration file in the project

• Add@ConfigurationAnnotation implementationWebMvcConfigurerInterface

• Rewrite the addCorsMappings method and set the code that allows cross-domain

The specific code is as follows:

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**") // 所有接口
                .allowCredentials(true) // 是否发送 Cookie
                .allowedOriginPatterns("*") // 支持域
                .allowedMethods("GET", "POST", "PUT", "DELETE") // 支持方法
                .allowedHeaders("*")
                .exposedHeaders("*");
    }
}

2. SpringBoot solves cross-domain access through CorsFilter

This method is similar to the above method, and also configures cross-domain access through Java Config. The specific code is as follows:

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;
@Configuration
public class MyCorsFilter {
    @Bean
    public CorsFilter corsFilter() {
        // 1.创建 CORS 配置对象
        CorsConfiguration config = new CorsConfiguration();
        // 支持域
        config.addAllowedOriginPattern("*");
        // 是否发送 Cookie
        config.setAllowCredentials(true);
        // 支持请求方式
        config.addAllowedMethod("*");
        // 允许的原始请求头部信息
        config.addAllowedHeader("*");
        // 暴露的头部信息
        config.addExposedHeader("*");
        // 2.添加地址映射
        UrlBasedCorsConfigurationSource corsConfigurationSource = new UrlBasedCorsConfigurationSource();
        corsConfigurationSource.registerCorsConfiguration("/**", config);
        // 3.返回 CorsFilter 对象
        return new CorsFilter(corsConfigurationSource);
    }
}

3. SpringBoot solves cross-domain issues through annotations

can be added to our controller class or controller method. Adding it to the class means that all methods in it can be cross-domain. Adding it to the method Indicates that the specified method can cross domains. The specific code is as follows:

import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/user")
@CrossOrigin
public class UserController {
    @GetMapping
    public String getAll() {
        return "成功";
    }
}

4. Configure CORS through nginx to solve cross-domain issues

If our project is usefulnginx When doing a reverse proxy server , you can also configure CORS in nginx to solve cross-domain issues. The configuration example is as follows:

1. Allow all domain names

server {
    ...
    location / {
        #允许 所有头部 所有域 所有方法
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Headers' '*';
        add_header 'Access-Control-Allow-Methods' '*';
        #OPTIONS 直接返回204
        if ($request_method = 'OPTIONS') {
            return 204;
        }
    }
    ...
}

2. Allow Specify domain name

map $http_origin $corsHost {
    default 0;
    "~https://aa.cn" https://aa.cn;
    "~https://bb.cn" https://bb.cn;
    "~https://cc.cn" https://cc.cn;
}
server {
    ...
    location / {
        #允许 所有头部 所有$corsHost域 所有方法
        add_header 'Access-Control-Allow-Origin' $corsHost;
        add_header 'Access-Control-Allow-Headers' '*';
        add_header 'Access-Control-Allow-Methods' '*';
        #OPTIONS 直接返回204
        if ($request_method = 'OPTIONS') {
            return 204;
        }
    }
    ...
}

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