Extend Cache PDFs
Configuration
The 'Extend Cache PDFs' filter is enabled by specifying:
- Apache:
ModPagespeedEnableFilters extend_cache_pdfs
- Nginx:
pagespeed EnableFilters extend_cache_pdfs;
Description
'Extend Cache PDFs' is a version of Extend Cache 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
<a href="example.jpg">, 'Extend Cache PDFs' would apply to
<a href="example.pdf">.
Operation
Extend Cache: Operation 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.
Example
You can see the filter in action at www.modpagespeed.com for cache-extending
PDFs
in HTML.
Limitations
In addition to the limitations of Extend Cache, 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.
Risks
This filter has the same risks as Extend Cache.