Normally, the client would send TCP/80 connection towards proxy server, and proxy server will connect to the outside webserver, and proxy the connection back to the client. In this case, the outside webserver will only see the proxy server ip address.
There are other types of proxy server which might act differently as follows:
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...