# About http URL and firewalls

Stephane Tellier (tellier@Techolap.COM)
Tue, 23 Feb 1999 13:04:09 -0500

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    Date: Tue, 23 Feb 1999 13:04:09 -0500

    From: "Stephane Tellier" <tellier@Techolap.COM>

    To: java-security@java.sun.com

    Subject: About http URL and firewalls

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Hi!

Our company is actually working on a 'Billing System' Applet,
written in 100% Java with the following structure :

Applet
Servlet
calls servlets via http, listen for response;
-------------------> connect to a Java server via a port
by sockets ------------------------------
calls images via
http.
listen the Java Server and sends results to the applet

Java Server
---------------> has a connection to an Oracle Database
with JDBC-ODBC
execute queries and sends
results to the servlet.

The Applet calls the servlets using URL class as follows (jdk
1.0.2):

String urlString = "http://"+ servlet_server + ":" + servlet_Port +
"/" + servlet_name + "?";
urlString += "QUERY=SELECT&DATAS=SOME_DATAS";

URL link = new URL (urlString);

// Reading results
DataInputStream line = new DataInputStream (link.openStream ());

// Reading first line, for example
String sLine = = line.readLine ();

My question is :
Does this suppose to bypass a standard firewall or not? Because I've
heard that http packets shouldn't be stopped by firewalls.
And what can we do with images?

Thanks.

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