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Web Proxy Caching > Caching HTTP alternates
1.
Navigate to Configure > Protocols > HTTP > Cacheability.
2.
In the Vary Based on Content Type section, click Enabled to cache alternate versions of HTTP documents that do not contain the Vary header.
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In the Vary by Default on Text field, enter the HTTP header field on which you want to vary if the request is for text (for example, an HTML document).
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In the Vary by Default on Images field, enter the HTTP header field on which you want to vary if the request is for images (for example, a .gif file).
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In the Vary by Default on Other Document Types field, enter the HTTP header field on which you want to vary if the request is for anything other than text or images.
Note 
If you specify Cookie as the header field on which to vary in the above fields, make sure that the appropriate option is enabled in the Caching Response to Cookies area of the Dynamic Caching section. For example, if you enable the Cache Only Image Types option in the Caching Response to Cookies area and you enable the Vary by Default on Text option in the Vary Based on Content Type section, alternates by cookie will not apply to text.
4.
Click Apply.
Note 
1.
Navigate to Configure > Protocols > HTTP > Cacheability.
2.
In the Maximum Alternates field, enter the maximum number of alternate versions of an object you want the proxy to cache. The default value is 3.
3.
Click Apply.

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Web Proxy Caching > Caching HTTP alternates