一个关于映射的问题

报错：
HTTP Status 405 - HTTP method GET is not supported by this URL
type： Status report

message： HTTP method GET is not supported by this URL

description： The specified HTTP method is not allowed for the requested resource (HTTP method GET is not supported by this URL).

js文件：
var url = "/blurry?layerName="+parent.layerFrame.cx_layer+"&value="+s;
location.href = url;

web.xml：

    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>com.common.util.BlurryAction</servlet-class>
           <init-param>
              <param-name>config</param-name>
     <param-value>/WEB-INF/webConfig.properties</param-value>
           </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
       <servlet-name>action</servlet-name>
       <url-pattern>/blurry</url-pattern>
    </servlet-mapping>

com.common.util.BlurryAction类extends HttpServlet，里面doGet和doPost都实现了，为什么提交的时候老是报上面的错误，请各位指点。
如果url改成具体的jsp，那么就可以提交过去。