Adding Filter causes GWT Host page to rendering twice

Hi,

   I have a production issue which i can easily reproducible in Normal GWT application as well, Below is the scenario

 

•  Created sample GWT application
  
• Added Servlet Filters in my web.xml (for Central Authantication System   ,which will not execute in this case,it will skip now and perform chain.dofilter for both the filters).
• Deploying this sample application on remote server(glassfish) and  accessing through VPN, causing the host page to render twice

Web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 

              http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

         version="2.5"

         xmlns="http://java.sun.com/xml/ns/javaee">

  <!-- Servlets -->

  <servlet>

    <servlet-name>greetServlet</servlet-name>

    <servlet-class>com.example.server.GreetingServiceImpl</servlet-class>

  </servlet>

  

  <servlet-mapping>

    <servlet-name>greetServlet</servlet-name>

    <url-pattern>/gwttest/greet</url-pattern>

  </servlet-mapping>

  

  

   <filter>

<filter-name>RedirectFilter</filter-name>

<filter-class>com.example.server.RedirectFilter</filter-class>

</filter>

        <filter>

<filter-name>CASResponseFilter</filter-name>

<filter-class>com.example.server.CASResponseFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>RedirectFilter</filter-name>

<url-pattern>/GWTTest.html</url-pattern>

</filter-mapping> 

        <filter-mapping>

<filter-name>CASResponseFilter</filter-name>

<url-pattern>/GWTTest.html</url-pattern>

</filter-mapping> 

  <!-- Default page to serve -->

  <welcome-file-list>

    <welcome-file>GWTTest.html</welcome-file>

  </welcome-file-list>

</web-app>

Deploying this app in one of our glassfish server which is accessiable through VPN,

If i access the application ,its rendering the html host page twice see the image

And the same if i deploy on my local server, html page is rendering fine.

Need suggestion why GWT application is behaving differently when we deployed on local & remote server(with adding servlet filter on host page)

Please suggest me how to fix this issue?

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