Re: performance when using a .htaccess

RewriteEngine  on
RewriteBase    /blog/
RewriteRule    ^/newblog/ $R1
Rewrite all files from one URL "blog" with a R permanent redirect to /blogs/?
The RewriteMap directive defines a
      Rewriting Map which can be used inside rule
      substitution strings by the mapping-functions to
      insert/substitute fields through a key lookup. The source of
      this lookup can be of various types.
      The MapName is
      the name of the map and will be used to specify a
      mapping-function for the substitution strings of a rewriting
      rule via one of the following constructs:
        ${ MapName :
        LookupKey }
         ${ MapName :
        LookupKey | DefaultValue
        }
      When such a construct occurs, the map MapName is
      consulted and the key LookupKey is looked-up. If the
      key is found, the map-function construct is substituted by
      SubstValue. If the key is not found then it is
      substituted by DefaultValue or by the empty string
      if no DefaultValue was specified.
      For example, you might define a
      RewriteMap as:
      RewriteMap examplemap txt:/path/to/file/map.txt
      You would then be able to use this map in a
      RewriteRule as follows:
      RewriteRule ^/ex/(.*) ${examplemap:$1}
      Description:
          This really is a hardcore example: a killer application
          which heavily uses per-directory
          RewriteRules to get a smooth look and feel
          on the Web while its data structure is never touched or
          adjusted.
drwxrwxr-x   2 netsw  users    512 Aug  3 18:39 Audio/
drwxrwxr-x   2 netsw  users    512 Jul  9 14:37 Benchmark/
drwxrwxr-x  12 netsw  users    512 Jul  9 00:34 Crypto/
drwxrwxr-x   5 netsw  users    512 Jul  9 00:41 Database/
drwxrwxr-x   4 netsw  users    512 Jul 30 19:25 Dicts/
drwxrwxr-x  10 netsw  users    512 Jul  9 01:54 Graphic/
drwxrwxr-x   5 netsw  users    512 Jul  9 01:58 Hackers/
drwxrwxr-x   8 netsw  users    512 Jul  9 03:19 InfoSys/
drwxrwxr-x   3 netsw  users    512 Jul  9 03:21 Math/
drwxrwxr-x   3 netsw  users    512 Jul  9 03:24 Misc/
drwxrwxr-x   9 netsw  users    512 Aug  1 16:33 Network/
drwxrwxr-x   2 netsw  users    512 Jul  9 05:53 Office/
drwxrwxr-x   7 netsw  users    512 Jul  9 09:24 SoftEng/
drwxrwxr-x   7 netsw  users    512 Jul  9 12:17 System/
drwxrwxr-x  12 netsw  users    512 Aug  3 20:15 Typesetting/
drwxrwxr-x  10 netsw  users    512 Jul  9 14:08 X11/
        Solution:
          The solution has two parts: The first is a set of CGI
          scripts which create all the pages at all directory
          levels on-the-fly. I put them under
          /e/netsw/.www/ as follows:
-rw-r--r--   1 netsw  users    1318 Aug  1 18:10 .wwwacl
drwxr-xr-x  18 netsw  users     512 Aug  5 15:51 DATA/
-rw-rw-rw-   1 netsw  users  372982 Aug  5 16:35 LOGFILE
-rw-r--r--   1 netsw  users     659 Aug  4 09:27 TODO
-rw-r--r--   1 netsw  users    5697 Aug  1 18:01 netsw-about.html
-rwxr-xr-x   1 netsw  users     579 Aug  2 10:33 netsw-access.pl
-rwxr-xr-x   1 netsw  users    1532 Aug  1 17:35 netsw-changes.cgi
-rwxr-xr-x   1 netsw  users    2866 Aug  5 14:49 netsw-home.cgi
drwxr-xr-x   2 netsw  users     512 Jul  8 23:47 netsw-img/
-rwxr-xr-x   1 netsw  users   24050 Aug  5 15:49 netsw-lsdir.cgi
-rwxr-xr-x   1 netsw  users    1589 Aug  3 18:43 netsw-search.cgi
-rwxr-xr-x   1 netsw  users    1885 Aug  1 17:41 netsw-tree.cgi
-rw-r--r--   1 netsw  users     234 Jul 30 16:35 netsw-unlimit.lst
          The DATA/ subdirectory holds the above
          directory structure, i.e. the real
          net.sw stuff and gets
          automatically updated via rdist from time to
          time. The second part of the problem remains: how to link
          these two structures together into one smooth-looking URL
          tree? We want to hide the DATA/ directory
          from the user while running the appropriate CGI scripts
          for the various URLs. Here is the solution: first I put
          the following into the per-directory configuration file
          in the DocumentRoot
          of the server to rewrite the announced URL
          /net.sw/ to the internal path
          /e/netsw:
RewriteRule  ^net.sw$       net.sw/        [R]
RewriteRule  ^net.sw/(.*)$  e/netsw/$1
          The first rule is for requests which miss the trailing
          slash! The second rule does the real thing. And then
          comes the killer configuration which stays in the
          per-directory config file
          /e/netsw/.www/.wwwacl:
Options       ExecCGI FollowSymLinks Includes MultiViews
#  first we rewrite the root dir to
#  the handling cgi script
RewriteRule   ^$                       netsw-home.cgi     [L]
RewriteRule   ^index\.html$            netsw-home.cgi     [L]
#  strip out the subdirs when
#  the browser requests us from perdir pages
RewriteRule   ^.+/(netsw-[^/]+/.+)$    $1                 [L]
#  and now break the rewriting for local files
RewriteRule   ^netsw-home\.cgi.*       -                  [L]
RewriteRule   ^netsw-changes\.cgi.*    -                  [L]
RewriteRule   ^netsw-search\.cgi.*     -                  [L]
RewriteRule   ^netsw-tree\.cgi$        -                  [L]
RewriteRule   ^netsw-about\.html$      -                  [L]
RewriteRule   ^netsw-img/.*$           -                  [L]
#  anything else is a subdir which gets handled
#  by another cgi script
RewriteRule   !^netsw-lsdir\.cgi.*     -                  [C]
RewriteRule   (.*)                     netsw-lsdir.cgi/$1
          Some hints for interpretation:
          Notice the L (last) flag and no
            substitution field ('-') in the forth partNotice the ! (not) character and
            the C (chain) flag at the first rule
            in the last partNotice the catch-all pattern in the last rule
        Reference:  http://httpd.apache.org/docs/2.0/misc/rewriteguide.html  (SEE also the excellent sections on blocking annoying robots, and other tricks).

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