这里写自定义目录标题
- 现象
- 排查思路
现象
f12控制台报错Access to XMLHttpRequest at ‘xxx’ from origin ‘xxxx’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
排查思路
- 确认跨域的请求方式，如果不是get,post请求，则需要在tongweb控制台放开；
- 确认后端项目有没有跨域配置 ，常见的有过滤器CorsFilter，@CrossOrigin等，如果有则不需要在tongweb中配置跨域，重复配置会导致冲突，跨域不生效；
- 没有使用跨域配置，在项目web.xml或者tongweb/conf/default-web.xml中配置；
<filter><filter-name>CorsFilter</filter-name><filter-class>com.tongweb.catalina.filters.CorsFilter</filter-class><init-param><!-- 允许访问资源的源列表。可以指定*表示接受任意域名的请求 --><param-name>cors.allowed.origins</param-name><param-value>*</param-value></init-param><init-param><!-- 以逗号分隔的HTTP方法列表 --><param-name>cors.allowed.methods</param-name><param-value>GET,POST,TRACE,OPTIONS,HEAD,DELETE,PUT,CONNNECT</param-value></init-param><init-param><!-- 跨域允许包含的头 --><param-name>cors.allowed.headers</param-name><param-value>Content-Type,X-Requested-With,accept,Origin,Access-Control- Request-Method,Access-Control-Request-Headers</param-value></init-param><init-param><param-name>cors.exposed.headers</param-name><param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials </param-value></init-param><init-param><param-name>cors.support.credentials</param-name><param-value>true</param-value></init-param><init-param><param-name>cors.preflight.maxage</param-name><param-value>10</param-value></init-param>
</filter>
<filter-mapping><filter-name>CorsFilter</filter-name><url-pattern>/*</url-pattern>
</filter-mapping>
