The corporate firewall is a double-edged sword. It helps prevent unauthorized access to the corporate Web services, but can disable access for legitimate clients. Due to the number of safety measures taken by system administrators, HTTP has become the uni
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Java JSP and Servlets HTTP tunneling with servlets Tutorial
The corporate firewall is a double-edged sword. It helps prevent unauthorized access to the corporate Web services, but can disable access for legitimate clients. Due to the number of safety measures taken by system administrators, HTTP has become the universal entry mechanism to the corporate network. Where technologies such as CORBA and DCOM have failed because of the firewall, technologies such as SOAP have been developed to provide safe and reliable access through firewall protection. In this article, we will explore an alternative to SOAP, the use of Java objects over HTTP. In addition, we will use J2EE servlet technology as server-side middleware to the business data.
Corporate security organizations set up firewalls to help prevent improper use of the corporate network. Unfortunately, the administrative mechanisms that restrict network traffic also hamper development efforts within the network.
Fortunately, the designers of the Java platform built networking into the language. It offers a safe, proven mechanism for working around the constraints of the firewall. In this article, I will show you how to use Java Servlet technology to create a tunnel to the business layer of your corporate network. At the end of the article, I will discuss other servlet-based methods of tunneling through the corporate firewall, including a quick run-down of the potential benefits and drawbacks of each method.
Keep in mind that each time you create an opening into your network, you create a potential break-in point. Use tunneling carefully. For example, you wouldn't want to allow a user to execute any operation, unrestricted, on the internal network. Used wisely, tunneling is a safe technique that combines flexibility with the protection of a firewall.
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