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巨坑：
和同事做联调（我后端，他前端）解决完跨域请求403错误，又冒出来一个405错误，查了近一个小时，最后发现是他请求的URL错了！发现post跨域请求原本404错误的，会因为是跨域而报405错误，让人脑袋疼！！！
关于解决CORS跨域请求403错误，filter方法：
@Component
public class CorsAllowFilter extends OncePerRequestFilter {
private static boolean isStaticResources( HttpServletRequest req ) {
String uri = req.getRequestURI();
return uri.endsWith(".ico") || uri.endsWith(".html");
}
@Override
protected void doFilterInternal( HttpServletRequest req, HttpServletResponse resp, FilterChain chain ) throws ServletException, IOException {
if (isStaticResources(req)) {
chain.doFilter(req, resp);
return;
}
resp.setHeader("Content-type", "application:json;charset=utf8");
resp.setHeader("Access-Control-Allow-Origin", "*");
resp.setHeader("Access-Control-Allow-Methods", "PUT,GET,POST,DELETE,OPTIONS");
resp.setHeader("Access-Control-Allow-Headers", "content-type,x-auth");
chain.doFilter(req, resp);
}
}
关于405错误参照：https://blog.csdn.net/qq_35804654/article/details/77272304
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