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超轻量级php框架startmvc

完美解决axios跨域请求出错的问题

更新时间:2020-06-26 09:12:01 作者:startmvc
错误信息:Responsetopreflightrequestdoesn'tpassaccesscontrolcheck:No'Access-Control-Allow-Origin'headerispresentont

错误信息:

Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:9000' is therefore not allowed access. The response had HTTP status code 403

随着前端框架的发展,如今前后端数据分离已经成了趋势,也就是说,前端只需要用ajax请求后端的数据合成页面,后端仅仅提供数据接口,给数据就行,好处就是前端程序员再也不用在自己的本地搭建Web服务器,前端也不需要懂后端语法,后端也不需要懂前端语法,那么简化了开发配置,也降低了合作难度。

常规的GET,POST,PUT,DELETE请求是简单请求(相对于OPTIONS请求),但是OPTIONS有点儿特别,它要先发送请求问问服务器,你要不要我请求呀,要我就要发送数据过来咯(这完全是根据自己的理解写的,如果有误,敬请谅解,请参考阮一峰大神原文。)

在Vue的项目里,Http服务采用Axios,而它正是采用OPTIONS请求。

如果仅仅在header里面加入: 'Access-Control-Allow-Origin':*,是并不能解决问题的,错误就是如文章开头所示。

这儿就需要后台对OPTIONS请求额外处理。

本文以Spring MVC为例:

添加一个拦截器类:


public class ProcessInterceptor implements HandlerInterceptor {

 @Override
 public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
 httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
 httpServletResponse.setHeader("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
 httpServletResponse.setHeader("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
 httpServletResponse.setHeader("X-Powered-By","Jetty");

 String method= httpServletRequest.getMethod();
 if (method.equals("OPTIONS")){
 httpServletResponse.setStatus(200);
 return false;
 }
 System.out.println(method);
 return true;
 }
 @Override
 public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
 }
 @Override
 public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
 }
}

在spring-mvx.xml配置Spring 拦截器:


<mvc:interceptors> 
 <bean class="cn.tfzc.ssm.common.innterceptor.ProcessInterceptor"></bean> 
 </mvc:interceptors> 

至此,问题已经解决:

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axios 跨域请求 出错