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It controls which domain names are handled by which sub-folder by utilizing different regular expression rules. Some tips to remember when creating the rules. # is used to comment out a line The following characters must be preceded by a '' to be recognized as a literal character ( meaning a character that represents itself) '.', '*', '?', '+', '(', ')', '{', '}', '[', ']', '^' and '$'. This becomes important when typing (www.domain.com) it would have to look like (www.domain.com) Parentheses are used to group items together to be marked as what is to be matched, such as '(apple)*' would match all of the string 'appleappleapple'. You can see more helpful expression tips here, http://www.isapirewrite.com/docs/examples Some examples of the rules you will see in the httpd.ini file look like this: #manual redirect of one domain RewriteCond Host: (www.)?domain1.com RewriteRule (.*) /domain1$2 #redirecting to another URL RewriteCond Host: (www.)?domain1.com RewriteRule (.+) http://www.domain2.com$1 [R] #Rewrite just one domain but keep the old link working RewriteCond Host: (www.)?domain1.com RewriteRule (?!/domain1)(.*) /domain1$2 [I] Many tricks come with a catch, and this is no exception. Article: Have you ever wanted to manage multiple domain names under a single story in IIS (Internet Information Services)? A non-competitive way to do this is to handle it from code. There are some disadvantages when handling this directly from code. Static pages aren't redirected, non-developers will need to purchase or dust off their programming books, and evidence remains that a redirection was done. Along came ISAPI Rewrite www.isapirewrite.com to solve this issue. Running at the ISAPI level in IIS, this is done in preparation for any page or code is accessed so it works equally well on static and dynamic content. It overcomes all the objections mentioned above. With well-kenned redirection code, the user would see something like this: http://www.domain1.com http://www.domain2.com/domain2 http://www.domain3.com/domain3 With the ISAPI Rewrite component, the user will see this: http://www.domain1.com http://www.domain2.com http://www.domain3.com Even though in the background the scenes the sites can be in completely different sub-folders, the person visiting the website won't have any concept of this. They will simply see the clarify domain names. ISAPI Rewrite will rewrite (kind of like a redirect) the user to a sub-folder even though the web browser doesn't realize this. This is done very fast and efficiently and managed by a file titled httpd.ini which should be placed in the root of the site. It controls which domain names are handled by which sub-folder by utilizing different regular expression rules. Some tips to remember when creating the rules. # is used to commentate out a line The following troupe must be preceded by a '' to be recognized as a literal character woman ( meaning a queer fish that represents itself) '.', '*', '?', '+', '(', ')', '{', '}', '[', ']', '^' and '$'. This becomes important when typing (www.domain.com) it would have to look like (www.domain.com) Parentheses are used to group items together to be marked as what is to be matched, such as '(apple)*' would match all of the string 'appleappleapple'. You can see more helpful expression tips here, http://www.isapirewrite.com/docs/examples Some examples of the rules you will see in the httpd.ini file look like this: #manual redirect of one domain RewriteCond Host: (www.)?domain1.com RewriteRule (.*) /domain1$2 #redirecting to ulterior URL RewriteCond Host: (www.)?domain1.com RewriteRule (.+) http://www.domain2.com$1 [R] #Rewrite just one domain but keep the old link working RewriteCond Host: (www.)?domain1.com RewriteRule (?!/domain1)(.*) /domain1$2 [I] Many tricks come with a catch, and this is no exception. One disadvantage that I have come versus is that the response.write from ASP or ASP.NET does not work well in conjunction with this component. correct paths are required since relative paths are done aft ISAPI Rewrite handles the request and aren't redirected as would be expected. The workaround is to use unmitigated paths with the full domain name in the redirect. If Server.Transfer is to be used, it should be tested as well. It runs into similar issues. Additionally, when using ASP or ASP.NET, the new virtual root folder should be marked as an request so that the new virtual root's folder is used for global.asa(x), web.config and /bin.
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