Appendix A. From Proxy to TMG
Understanding the HTTP Protocol 911
Understanding Proxy Servers 918
The History Behind TMG 923
The HTTP (Hypertext Transfer Protocol) is an application-level protocol that became very popular with the explosion of the virtual world that we know as the Internet. Almost everything that we do on the Internet is performed using the HTTP, and at the same pace that HTTP became popular it also became a very popular protocol to use maliciously. Without the additional security implemented on top of HTTP, the current online world and the business done over the Internet could not be conducted in a secure manner. Therefore, you need to understand how security is applied to HTTP as well as understand the behavior of common protocols. ...
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