Tomcat CORS 过滤器 [英] Tomcat CORS filter

问题描述

我想启用 tomcat CORS 过滤器，我将其添加到 web.xml 中:

<filter-name>Cors​​Filter</filter-name><filter-class>org.apache.catalina.filters.CorsFilter</filter-class></过滤器><过滤器映射><filter-name>Cors​​Filter</filter-name><url-pattern>/*</url-pattern></过滤器映射>

但它不起作用.我尝试使用自定义过滤器:

<filter-name>SimpleCORSFilter</filter-name><filter-class>com.common.SimpleCORSFilter</filter-class></过滤器><过滤器映射><filter-name>SimpleCORSFilter</filter-name><url-pattern>/*</url-pattern></过滤器映射>

有了这个类:

public class SimpleCORSFilter 实现 Filter {public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) 抛出 IOException, ServletException {HttpServletResponse 响应 = (HttpServletResponse) res;response.setHeader("Access-Control-Allow-Origin", "*");response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");response.setHeader("Access-Control-Max-Age", "3600");response.setHeader("Access-Control-Allow-Headers", "x-requested-with");chain.doFilter(req, res);}}

这很好用，你能告诉我为什么吗?我不知道这是否重要，但我使用的是 Spring Framework.

解决方案

过滤器 org.apache.catalina.filters.CorsFilter 首先在请求中寻找一个标头:Origin.如果此标头不存在，则过滤器不会在响应中添加任何标头.也许因为这个原因行不通.

此外，在 POST 请求中，查找标头 Content-Type.其他方法也会发生类似的情况.可能你想看看 代码这个过滤器.换句话说，还有一个流程图:>

I want to enable tomcat CORS filter, i added this to web.xml:

<filter>
    <filter-name>CorsFilter</filter-name>
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>CorsFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

But it doesn't work. I tried with a custom filter:

<filter>
    <filter-name>SimpleCORSFilter</filter-name>
    <filter-class>com.common.SimpleCORSFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>SimpleCORSFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

With this Class:

public class SimpleCORSFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
        chain.doFilter(req, res);
    }
}

And this well works, can you tell me why? I don't know if it is important but I'm usign Spring Framework.

解决方案

The filter org.apache.catalina.filters.CorsFilter seek first a header in the request: Origin. If this header does not exist, the filter does not add any header in the response. Perhaps for that reason does not work.

Additionally, in a POST request, look for the header Content-Type. Something similar happens to other methods. May you want to see the code of this filter. In another way, there is a flowchart:

这篇关于Tomcat CORS 过滤器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！