Canonicalize JS libraries
JavaScriptRedirects well-known library files to a shared, canonical, cacheable URL.
Filter
canonicalize_javascript_libraries
· Filter docs
A mod_pagespeed 1.15 filter. ModPageSpeed 2.0 applies it as part of one always-on pipeline, not as a separate switch.
Both frames render identically — that's the goal. The win is in the bytes and requests
below, not the look. They're served live by mod_pagespeed 1.15 on
demo-httpd-1.1.modpagespeed.com; the optimized frame
applies only this filter. Right after a cache purge it may briefly match the original while
the worker rewrites it — reload to see the result.
This filter needs configuration or content the public demo doesn't provide (e.g. an Analytics account id or a recognized JavaScript library), so there's no diff to show here — see the filter docs for what it does.
Run this on your own site
This is one of 47 filters mod_pagespeed 1.15 applies in place — self-hosted on
Apache, nginx, and IIS. Install and run it: it optimizes right away and adds an
X-PageSpeed-Warn: unlicensed header until you license it. A
commercial license is required for production use.