Cross-Origin Resource Sharing 跨來源資源共享

近期在部屬專案時因為測試都在地端或本機，二階段測試上雲並掛上https 、網域及tls憑證後，不斷地爆各種cros 錯誤,所以來了解一下

後端server 未設定cros

如果後端伺服器沒有設定允許你的網域訪問，則會出現 CORS 錯誤

No Access-Control-Allow-Origin

springboot

我這邊的後端server 是採用springboot, 因此可以在security chain中加入

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors().and()
                .authorizeRequests()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .and()
                .logout();
    }

    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("https://example.com")); // 允許的網域
        configuration.setAllowedMethods(Arrays.asList("GET", "POST")); // 允許的 HTTP 方法
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }
}

nodejs

const express = require('express');
const cors = require('cors');

const app = express();

var corsOptions = {
    origin: 'https://example.com', // 允許的網域
    methods: ['GET', 'POST'], // 允許的 HTTP 方法
    credentials: true, // 允許帶有 cookies 的請求
    allowedHeaders: ['Authorization', 'Cache-Control', 'Content-Type'] // 允許的 headers
};

app.use(cors(corsOptions));

// 其他路由和中間件...

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

nginx

cros.config

server {
    listen 80;

    location / {
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' 'https://example.com';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            #
            # Custom headers and headers various browsers *should* be OK with but aren't
            #
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
            #
            # Tell client that this pre-flight info is valid for 20 days
            #
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
         }
         if ($request_method = 'POST') {
            add_header 'Access-Control-Allow-Origin' 'https://example.com';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
            add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
         }
         if ($request_method = 'GET') {
            add_header 'Access-Control-Allow-Origin' 'https://example.com';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
            add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
         }
    }
}

指令

include /path/to/your/cors.conf;
docker restart <container-id>

以上三種方法都會讓只有 https://example.com 這個網域可以直接訪問，另外因為只設定GET POST 如果使用 PUT DELETE 也會被擋