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| <h1>Extend Cache PDFs</h1><h2>Configuration</h2> |
| <p> |
| The 'Extend Cache PDFs' filter is enabled by specifying: |
| </p> |
| <dl> |
| <dt>Apache:<dd><pre class="prettyprint" |
| >ModPagespeedEnableFilters extend_cache_pdfs</pre> |
| <dt>Nginx:<dd><pre class="prettyprint" |
| >pagespeed EnableFilters extend_cache_pdfs;</pre> |
| </dl> |
| in the configuration file. |
| |
| <h2>Description</h2> |
| <p> |
| 'Extend Cache PDFs' is a version of <a href="filter-cache-extend">Extend |
| Cache</a> that acts on PDFs. Unlike 'Extend Cache' it applies not only to |
| resources but also to hyperlinks. For example, while 'Extend Cache' would not |
| apply to <code><a href="example.jpg"></code>, 'Extend Cache |
| PDFs' would apply to <code><a href="example.pdf"></code>. |
| </p> |
| |
| <h2>Operation</h2> |
| <p> |
| <a href="filter-cache-extend#operation">Extend Cache: Operation</a> describes |
| the standard operation of cache extension in PageSpeed. This filter identifies |
| PDF URLs by their ".pdf" extension and marks them as eligible for cache |
| extension. |
| </p> |
| <h3>Example</h3> |
| <p> |
| You can see the filter in action at <code>www.modpagespeed.com</code> for |
| cache-extending PDFs |
| <a |
| href="http://www.modpagespeed.com/extend_cache_pdfs.html?ModPagespeed=on&ModPagespeedFilters=extend_cache_pdfs" |
| >in HTML</a>. |
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| |
| <h2>Limitations</h2> |
| <p> |
| In addition to the <a href="filter-cache-extend#limitations">limitations of |
| Extend Cache</a>, this filter is limited by its reliance on file extensions for |
| identifying potential PDF URLs. PDF resources with URLs ending in something |
| other than ".pdf" won't be considered for cache extension. |
| </p> |
| <h2>Risks</h2> |
| <p> |
| This filter has the same risks as <a href="filter-cache-extend#risks">Extend |
| Cache</a>. |
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