The disk cache stores retrieved documents locally, whence they can be retrieved more quickly. When requesting a URL that is in the cache, the library checks to see if the page has changed since it was last retrieved from the remote machine. If not, the local copy is used, saving the transmission over the network. Currently the cache isn’t cleared automatically.
Setting this variable non-nil causes documents to be cached
automatically.
This variable specifies the
directory to store the cache files. It defaults to sub-directory
cache of url-configuration-directory.
The cache relies on a scheme for mapping URLs to files in the cache.
This variable names a function which sets the type of cache to use.
It takes a URL as argument and returns the absolute file name of the
corresponding cache file. The two supplied possibilities are
url-cache-create-filename-using-md5 and
url-cache-create-filename-human-readable.
Creates a cache file name from url using MD5 hashing. This is creates entries with very few cache collisions and is fast.
(url-cache-create-filename-using-md5 "http://www.example.com/foo/bar") ⇒ "/home/fx/.url/cache/fx/http/com/example/www/b8a35774ad20db71c7c3409a5410e74f"
Creates a cache file name from url more obviously connected to
url than for url-cache-create-filename-using-md5, but
more likely to conflict with other files.
(url-cache-create-filename-human-readable "http://www.example.com/foo/bar") ⇒ "/home/fx/.url/cache/fx/http/com/example/www/foo/bar"
This function returns non-nil if a cache entry has expired (or is absent).
The arguments are a URL and optional expiration delay in seconds
(default url-cache-expire-time).
This variable is the default number of seconds to use for the
expire-time argument of the function url-cache-expired.
This function takes a URL as its argument and returns a buffer containing the data cached for that URL.