502 bad gateway

web项目的web.xml文件中加入了禁用http delete方法后出现502 bad gateway,使用ip可正常访问,使用的是阿里云的SLB负载均衡
web.xml中加入的代码如下:

               <web-resource-collection>  
                    <url-pattern>/*</url-pattern>  
                    <http-method>PUT</http-method>  
                    <http-method>DELETE</http-method>  
                    <http-method>HEAD</http-method>  
                    <http-method>OPTIONS</http-method>  
                    <http-method>TRACE</http-method>  
               </web-resource-collection>  
               <auth-constraint>  
               </auth-constraint>  
             </security-constraint>  
             <login-config>  
               <auth-method>BASIC</auth-method>  
             </login-config>