Restricting PageSpeed from rewriting URLs of introspective JavaScript

Filters that change URLs of JavaScript files are at times incompatible with JavaScript code that does string-manipulation on its own URL. To avoid problems with introspective JavaScript files, PageSpeed can be configured to skip URL-rewriting for such files. PageSpeed uses simple heuristics to determine whether a JavaScript file is introspective.

This affects filters rewrite_javascript, combine_javascript, inline_javascript, extend_cache, and extend_cache_scripts.

This feature is on by default, but for many sites these heuristics are too conservative and prevent optimizations that would actually be safe. To turn it off:

pagespeed AvoidRenamingIntrospectiveJavascript off

This directive can be used in location-specific configuration sections.