Installation guide

Trend Micro™ InterScan™ Web Security Virtual Appliance 6.5 Installation Guide
2-18
HTTP Proxy in Dependent Mode (Proxy Ahead
Web page requests follow this sequence:
1. The Web client sends a request to the HTTP service.
2. The HTTP service validates the request.
• If the URL is invalid (blocked), the HTTP service sends the HTTP client an
appropriate notice, completing the transaction.
• If the URL is valid, the HTTP service forwards the request to an upstream
HTTP proxy server.
3. The upstream proxy server performs its processing, then forwards the request to
the Web site on the Internet.
4. The contacted Web site returns a response (ideally a Web page) to the HTTP proxy
server.
5. The HTTP proxy server performs its processing on the returned data, then
forwards the response data to the IWSVA HTTP service.