axiom.c
Using ISAPI_Rewrite For SEO Friendly URLS
Author → Asif → in IIS → on Jun 14 2008 5:17PM
Tags:
IIS
isapi
RewriteRule
regex
ISAPI_Rewrite is sort of like mod_rewrite, so if your familiar with it and comfortable with regular expression then you should have no problem setting this up. Normally, In Apache, you would use .htaccess files to enable mod_rewrite and write your regular expressions, but with IIS .htaccess is not supported thus you would use httpd.ini file in your root directory.
If you don't manage your IIS or if your hosting provider doesn't support ISAPI_Rewrite, then you might want to look up http://cheeso.members.winisp.net/IIRF.aspx or http://www.urlrewriter.net. Thankfully, my web host, LFC Hosting, supports ISAPI_Rewrite.
Here are a few examples
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In your Httpd.ini file:
[ISAPI_Rewrite]
# Block external access to the httpd.ini and httpd.parse.errors files
RewriteRule /httpd(?:\.ini¦\.parse\.errors) / [F,I,O]
# Block external access to the Helper ISAPI Extension
RewriteRule .*\.isrwhlp / [F,I,O]
RewriteRule .*(?:global.asa|default\.ida|root\.exe|\.\.).* . [F,I,O]
#force trailing slash
RewriteCond Host: (.*)
RewriteRule ([^.?]+[^.?/]) http\://$1$2/ [I,R]
#Hide file extension
RewriteCond %{REQUEST_FILENAME}.aspx -f
RewriteRule (.*) $1.aspx
#force https on a directory
RewriteCond %HTTPS (?!on).*
RewriteRule /DIRECTORY(/.*)? https\://www.site.com/DIRECTORY$1 [R,L]
#Rewrite querystring for a particular page using directory rewrite
RewriteRule .*page/(.*)/(.*)/(.*) /page.aspx?var1=$1&var2=$2&var3=$3 [I]
// I use this rule on this site as you can see from the url
Of course, the directory rewrite will break page-relative links to images, CSS, etc. You can either implement a non-directory rewrite, change all page-relative links to root-relative or absolute, or you can do what I do and use the <base href=""> tag. I use the that tag in my site.master and it has been easy for me.
More rewrites......
#Rewrite non-specific page querystring
#http://www.mysite.com/foo.asp?a=A&b=B&c=C ==>
#http://www.myhost.com/foo.asp/a/A/b/B/c/C
RewriteRule ^(.*?\.aspx)/([^/]*)/([^/]*)(/.+)? $1$4?$2=$3 [NC,LP,QSA]#If you wanted to do http://www.myhost.com/foo.asp~a~A~b~B~c~C
RewriteRule ^(.*?\.asp)~([^~]*)~([^~]*)(.*) $1$4?$2=$3 [NC,LP,QSA]
#Stop image hot-linking
RewriteCond %{HTTP:Host}#%{HTTP:Referer} ^([^#]+)#(?!http://\1).+
RewriteRule .*\.(?:gif|jpg|png) /block.gif [NC]
#Browser dependant content
RewriteCond %{HTTP:User-Agent} MSIE
RewriteRule /foo\.htm /foo.IE.htm [L]
RewriteCond %{HTTP:User-Agent} (?:Lynx|Mozilla/[12])
RewriteRule /foo\.htm /foo.20.htm [L]
RewriteRule /foo\.htm /foo.32.htm [L]
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