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http.head (in revision . Because many scripts tend to request the same object,
this helps to prevent sending duplicate requests that consume network
resources needlessly.
The cache is transparent to the script writer in that it will return a cached
result if present when http.get/http.head is called. How the cache is used may
be controlled by options table (described in [1]) passed to the http functions.
Three new boolean values are present:
o bypass_cache -- The contents of the cache is ignored for the request
(method == "GET" or "HEAD")
o no_cache -- The result of the request is not saved in the cache
(method == "GET" or "HEAD")
o no_cache_body -- The body of the request is not saved in the cache
(method == "GET" or "HEAD")
The size of the cache is by default 1 MB. The size can be changed using the
script arg (--script-args) http-max-cache-size (e.g. --script-args
http-max-cache-size=1e8).
[1] http://nmap.org/nsedoc/lib/http.html#request
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).