Dynamic Robots.txt Rules for Apache Security
Feb 06, 2009, 19:33 (0 Talkback[s])
(Other stories by Ken Coar)
Re-Imagining Linux Platforms to Meet the Needs of Cloud Service Providers
"This one is rather more complex, so let's go through it field
by field, and follow that with some examples. The value of the
'pattern' field is key; it is to this value that aspects of the
client request are compared to see if a particular rule matches or
not. It might contain a string or a regular expression; how it is
interpreted is controlled by the 'mode' field.
"Ordinarily, the value of the user-agent line of the robots.txt
stanza will come directly from the request's 'User-agent' header
field. The 'alias' field in the table provides a means to override
this. For instance, the rule may actually have matched Firefox, but
you can say that it matched Opera.
"The awkwardly-named 'field' field specifies which aspect of the
request is to be matched against the pattern. I have found use only
for the user-agent and the IP address, but there is no reason
others might not be used."