Java chat client behind the proxy or fire wall

i am developing the chat application useing java.net.*.but i am not able to get connectivity behind the firewall or proxy on the java client.pls help me out

to guarantee easy to use, no problem chat applet then you will need to have the chat server running on port 80 and the client use http request/response system
first problem is that the applet will have to have been delivered from port 80 on the same ip# so you will either have to use Servlets or write your own web server with chat facilities
you will need to maitain persistent/ pseudo persistent http connections for the server to deliver messages to clients, you can assume that a connection will remain open for ~ 5 minutes after a request from the client
use HTTP/1.1 for reliable Connection: keep-alive and request/response pipelining
with all that in place your client method is...
register and send GET /chat <wait for upto 5 mins>
if there is client activity send POST/chat <wait for upto 5 mins>
if the above waits timeout send GET/chat <wait for upto 5mins>
server method...
accept GET/POST requests from client
if there is chat to deliver, reply to most recent request from client
if you recive another request before the previous one's reply is used, send a No Content reply to the previous request

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null

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Java chat client behind the proxy or fire wall

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