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AsyncOS 9.1 for Cisco Web Security Appliances User Guide
 
Chapter 4      Intercepting Web Requests
  Web Proxy Options for Intercepting Web Requests
Step 5
Submit and commit your changes.
Related Topics
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Web Proxy Cache
The web proxy caches data to increase performance. AsyncOS includes defined caching modes that 
range from safe to aggressive, and also allows customized caching. You can also exclude specific URLs 
from being cached, either by removing them from the cache, or by configuring the cache to ignore them. 
Clearing the Web Proxy Cache
Step 1
Choose Security Services > Web Proxy.
Step 2
Click Clear Cache and confirm your action.
Removing URLs from the Web Proxy Cache
Step 1
Access the CLI.
Step 2
Use the 
webcache 
evict 
commands to access the required caching area:
example.com> webcache
Choose the operation you want to perform:
- EVICT - Remove URL from the cache
- DESCRIBE - Describe URL cache status
- IGNORE - Configure domains and URLs never to be cached
[]> evict
Enter the URL to be removed from the cache.
[]>
Step 3
Enter the URL to be removed from the cache.
Use Received Headers
Allows a Web proxy deployed as an upstream proxy to identify clients using 
X-Forwarded-For headers send by downstream proxies. The Web Proxy will 
not accept the IP address in a X-Forwarded-For header from a source that is 
not included in this list.
If enabled, requires the IP address of a downstream proxy or load balancer 
(you cannot enter subnets or host names).
Range Request 
Forwarding
Use the Enable Range Request Forwarding checkbox to enable or disable 
forwarding of range requests. Refer to 
 
for more information.