解决跨域No 'Access-Control-Allow-Origin' header is present on the requested resource.
用angular发起http.get(),访问后端web API要数据,结果chrome报错:跨域了
Access to XMLHttpRequest at 'http://127.0.0.1:3000/XXX'
from origin 'http://127.0.0.1:4200' has been blocked by CORS policy:
No 'Access-Control-Allow-Origin' header is present on the requested resource.
此时后端nodejs显示返回值正常。只是浏览器给拦截了。
参考https://www.cnblogs.com/relucent/p/4274158.html
什么是跨域
当两个域具有相同的协议(如http), 相同的端口(如80),相同的host(如www.google.com),那么我们就可以认为它们是相同的域(协议,域名,端口都必须相同)。
跨域就指着协议,域名,端口不一致,出于安全考虑,跨域的资源之间是无法交互的
解决方法很简单,在服务器端的response里添加header,允许前端指定的主机访问
具体到express 参考 https://www.cnblogs.com/ae6623/p/4433143.html
注意要包括 http://,和端口号,最好把这些写在一个配置文件里,在nodejs启动时加载进来,便于在docker等容器里用的时候修改前端的IP和端口
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