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In a reverse proxy configuration, the client sends HTTP requests to the reverse proxy server as if the reverse proxy server were the Web server. In host-header forwarding, the reverse proxy server then forwards the HTTP packets to the actual Web server while preserving the host header in the HTTP packets. On the Web server, Windows SharePoint Services uses the host header information to generate hyperlinks on pages that will be reachable by the client. The Web server then sends HTTP responses through the reverse proxy server to the client. The following illustration shows an example of a host-header forwarding configuration:
Figure2. Host-Header Forwarding Illustration
For information about setting up host-header forwarding with MicrosoftInternetSecurityandAcceleration (ISA) Server, see the sections Configuring Host-Header Forwarding with ISA Server 2000 and Configuring Host-Header Forwarding with ISA Server 2004 later in this article.