Creating time-sensitive URLs in .NET framework

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Creating time-sensitive URLs
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Ever wonder whether it would be possible to have a URL that would point to different files based on time Well, mod_rewrite makes it easy to create such a URL There are a lot of variables named TIME_xxx for rewrite conditions Using the special lexicographic comparison patterns <STRING, >STRING, and =STRING you can do time-dependent redirects, for example:
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RewriteCond RewriteCond RewriteRule RewriteRule %{TIME_HOUR}%{TIME_MIN} %{TIME_HOUR}%{TIME_MIN} ^foo\html$ ^foo\html$ >0700 <1900 foodayhtml foonighthtml
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This provides the content of foodayhtml under the URL foohtml from 07:00 to 19:00, and the remaining time provides the contents of foonighthtml
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Part II Web Site Administration
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Content Handling
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The examples in this section deal with content-specific rewriting rules I show you how to create backward-compatible URLs, browser-based content rewriting, enduser transparent HTML to CGI redirects, and more
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Adding backward compatibility in URLs
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Say that you have recently renamed the page barhtml to foohtml and now you want to provide the old URL for backward compatibility Additionally, you do not want the users of the old URL to recognize that the page was renamed How can this be done Here is how:
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RewriteRule ^foo\html$ barhtml
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If you want to let the browser know about the change, you can do an external rewrite so that the browser will display the new URL All you need to do is add the R flag as follows:
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RewriteRule ^foo\html$ barhtml [R]
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Creating browser-matched content URLs
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You can use rewrite rules to dish out different contents (using internal subrequests) to different browsers You cannot use content negotiation for this because browsers do not provide their types in that form Instead, you have to act on the HTTP header User-Agent For example, if a browser s User-Agent header matched Mozilla/5 then you can send out a Netscape Navigator 5 (or above) features-friendly page, or you can send out a different page if the browser is either an older version of Navigator or another type of browser If the HTTP header User-Agent begins with Mozilla/5, the page foohtml is rewritten to fooNShtml and the rewriting stops If the browser is Lynx or Mozilla versions 1 to 4, the URL becomes foodullhtml All other browsers receive the page foocoolhtml This is done by the following rules:
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RewriteCond %{HTTP_USER_AGENT} RewriteRule ^foo\html$ RewriteCond %{HTTP_USER_AGENT} RewriteCond %{HTTP_USER_AGENT} RewriteRule ^foo\html$ ^Mozilla/5* foocoolhtml [L]
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^Lynx/* [OR] ^Mozilla/[1234]* foodullhtml [L]
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When a request for an URL such as http://hostname/foohtml is received, the first condition tests whether the environment variable HTTP_USER_AGENT has a value that contains the string Mozilla/5 or not If it does contain the string, then the first rule is applied This rule substitutes foocoolhtml for the original URL
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9 Rewriting Your URLs
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and all rewriting is complete; however, when the first rule is not applied, the second rule is invoked There are two OR conditions In other words, one of these conditions must match before this rule can be applied The first condition tests the same environment variable for the substring Lynx/, and the second condition tests the same environment variable for the substring Mozilla/1 through Mozilla/4 If any of these conditions are met, the rule is applied The rule substitutes foodullhtml, the original URL The substituted URL is turned into a subrequest and is processed by Apache as usual
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Creating an HTML to CGI gateway
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If you want to seamlessly transform a static page foohtml into a dynamic variant foocgi that is, without informing the browser or user here s how:
RewriteRule ^foo\html$ foocgi [T=application/x-httpd-cgi]
The rule rewrites a request for foohtml to a request for foocgi It also forces the correct MIME-type, so that it is run as a CGI script A request such as http:// hostname/foohtml is internally translated into a request for the CGI script The browser does not know that its request was redirected
Access Restriction
These examples deal with access control issues In this section I show you how to control access to certain areas of your Web site using the URL rewrite module