When I look through my access log for Apache, i notice this in it:
217.135.208.163 - - [27/Jul/2004:21:52:01 +0100] "SEARCH /\x90\xc9
\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\
.....
\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\xc9\x90\x90\x90
\x90\x90\x90\x90\x90\x90\x90\x90HTTP/1.0" 414 404
(I have cut out some of it where the ... are because it would look unsightly in this thread.)
Sometimes the robots.txt file is requested but not always.
Is it a search engine searching my site or something else
???