CORS

同源策略

协议、域名、端口 3个都相同就是同源

Angular: http://localhost:8080

Spring Boot: http://localhost:8181

协议: http

域名: localhost

端口: 8080 VS 8181 不同

CORS: Cross Origin Resource Sharing

https://www.bilibili.com/video/BV12U4y1f7Qi/?spm_id_from=333.337.search-card.all.click&vd_source=73e7d2c4251a7c9000b22d21b70f5635