US Patent 9407717 Selective prefetch scanning

The present invention relates to systems, apparatus, and methods of enhancing prefetcher functionality by scanning responses object requests. In certain embodiments, prefetching is improved by identifying references to container objects or sections of container objects at a proxy server. When URLs are identified as part of a container object, a prefetching determination or adjustment to a prefetching decision is made according to the identification of the reference for a subset of URLs identified by the reference to the container object. For example, prefetching of URLs located in cascading style sheet (CSS) files may be restricted to a subset of URLs which are identified by a CSS rule.