前言:公司的SpringBoot项目出于某种原因,经常样处理一些跨域请求. 一.以前通过查阅相关资料自己写的一个处理跨域的类,如下. 1.1首先定义一个filter(拦截所有请求,包括跨域请求) public class CrossDomainFilter implements Filter { @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) t
1.通过允许跨域访问实现了跨域请求,但为了使每个请求带上session信息,我设置了withCredentials ,即: axios.defaults.withCredentials = true 然后跨域请求时会出现如下问题: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Origin' header in the response
让api请求允许跨域 header("Access-Control-Allow-Origin:*");header('Access-Control-Allow-Credentials:true');header('Access-Control-Allow-Methods:GET, POST, OPTIONS');
1.情景展示 ajax调取java服务器请求报错 报错信息如下: 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. 但是,请求状态却是成功:200,这是怎么回事? 2.原因分析 ajax请求跨域:ajax出现请求跨域错误问题是因为浏览器的“同源策略”. 同源策略:1995年,同源政策由 Netscap
js跨域访问提示错误:XMLHttpRequest cannot load http://...... No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. 解决方法: 1.如果请求的url是aspx页面,则需要在aspx页面中添加代码:Response.AddHeader("Access-Contro