Microweb PRO Series Guide d'installation Page 48

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Trend Micro™ InterScan™ Web Security Virtual Appliance 6.5 Installation Guide
2-20
Web page requests follow this sequence:
1. The Web client sends a request to the HTTP proxy server.
2. The proxy server forwards the request to IWSVA.
3. IWSVA validates the request using URL Filtering/URL Access Control:
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 the Web server
on the Internet.
4. The contacted Web server returns a response (ideally a Web page) to IWSVA.
5. IWSVA performs its processing on the returned data (virus, spyware, ActiveX
scanning), then forwards the appropriate response/data to the proxy server.
6. The Proxy server caches the data (if cacheable), then delivers the response/data to
the HTTP client.
F
IGURE
2-9.
HTTP Proxy in Dependent Mode (Proxy Behind)
T
ABLE
2-5.
HTTP Proxy in Dependent Mode (Proxy Behind)
A
DVANTAGES
L
IMITATIONS
No configuration changes required
on the clients.
Configuration changes or pattern
updates on IWSVA do not affect cached
objects.
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