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Web Proxy Caching > Ensuring cached object freshness > HTTP object freshness > Specifying header requirements
Specifying header requirements
Help | Content Gateway | Version 8.1.x
To ensure freshness of the objects in the cache, configure Content Gateway to cache only objects with specific headers.
 
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Warning 
By default, the proxy caches all objects (including objects with no headers). Websense recommends that you change the default setting only for specialized proxy situations. If you configure the proxy to cache only HTTP objects with Expires or max-age headers, the cache hit rate will be seriously reduced (very few objects have explicit expiration information).
1.
Navigate to the Configure > Protocols > HTTP > Cacheability tab.
2.
In the Required Headers area of the Behavior section, select one of the following:
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An Explicit Lifetime Header to cache only HTTP objects with Expires or Cache-Control headers.
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A Last-Modified Header to cache only HTTP objects with Expires or Last-Modified headers.
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No Required Headers to cache all HTTP objects (no specific headers are required). This is the default.
3.
Click Apply.

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Web Proxy Caching > Ensuring cached object freshness > HTTP object freshness > Specifying header requirements
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