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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.
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