GetCacheFileNameFromURL returns name of the file in cache for this URL.

New returns a new Downloader which caches page loads on disk and can return pages from that cache.

NewDirectoryCache returns a new DirectoryCache which caches files in a directory.

Sha1OfURL returns sha1 of url.

DirectoryCache implements disk-based Cache interface.

Downloader implements optimized (cached) downloading of pages from the server.

EventDidDownload is for logging.

EventDidReadFromCache is for logging.

EventError is for logging.

EventGotVersions is for logging.

Cache describes a caching interface.