Cannot getRemoteAddr through WebCache

Question

I use the command request.getRemoteAddr() to get the client's IP address which works only when hitting the port 7778 of the application server. When hitting port 80 (of the Oracle WebCache), the command returns the IP of the server host (which is natural since the web cache is now the client for the application server).
Does anybody know what I can do?
Thanx in advance
Lambros

Answer 1

There is actually a way to find the original client's ip.
It is true that the client ip is substituted with the Web Cache ip, but the Web Cache stores the original ip-address in the header request as "CLIENTIP".
If you want your application to fetch the correct ip in request.getRemoteAddr(), you could write a servlet filter that wraps the HttpServletRequest with a new class that returns the correct ip.
Example:
public class IpChangeFilter implements Filter {
public void doFilter( ServletRequest pRequest, ServletResponse pResponse, FilterChain pChain) throws IOException, ServletException {
if( pRequest instanceof HttpServletRequest)
pChain.doFilter( new IpChangeRequest( (HttpServletRequest)pRequest), pResponse);
else
pChain.doFilter( pRequest, pResponse);
And the wrapper:
private class IpChangeRequest extends HttpServletRequestWrapper {
public String getRemoteAddr() {
String tNewIp = getHeader( "CLIENTIP");
if( tNewIp==null || tNewIp.length()==0)
tNewIp = super.getRemoteAddr();
return tNewIp;
public int getServerPort() {
if( super.getServerPort()==7778)
return 80;
else
return super.getServerPort();
Hope this helps!
-Glenn