HttpIpModifier

A J2EE HTTP filter for reading request ip from the right HTTP header.

What it can do

When you deploy your web app behind the Nginx or other front-end servers, ip value in http header will be the ip of the front-end server but not the client's, this is obviously not what we want . Here is the small utility to handle this situation by override the getRemoteAddr() method of HttpServletRequest.

Configuration

What you need to do is to add this filter to your project and set the correct http header name of ip value, here is the example configuration for web.xml:

<filter>
    <filter-name>HttpIpModifierFilter</filter-name>
    <filter-class>cn.libofeng.utilities.filter.ip.HttpIpModifierFilter</filter-class>
    <init-param>
        <param-name>ip-header-name</param-name>
        <param-value>HTTP_X_FORWARDED_FOR</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>HttpIpModifierFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>