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Web Proxy Caching > Ensuring cached object freshness > HTTP object freshness > Specifying header requirements
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By default, the proxy caches all objects (including objects with no headers). As a bet practice, 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).
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1.
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Navigate to the Configure > Protocols > HTTP > Cacheability tab.
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2.
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Under Behavior > Required Headers, 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.
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3.
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Click Apply.
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Web Proxy Caching > Ensuring cached object freshness > HTTP object freshness > Specifying header requirements
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