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ALP is implemented as an Asynchronous Pluggable Protocol. It acts like a WEB server but without need of network. It executes WEB applications such as ASP pages and CGI applications. ALP makes Internet Explorer to be server and client. With ALP you can write stand-alone desktop applications, CD-ROM autoruns, use ASP for pure desktop software and still keep your code ready to run on WEB servers too.
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 ISAPI Redirector filter   
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ISAPI Redirector filter
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ISAPI Redirector filter

The purpose of that filter is redirecting requests sent to specific URLs to one or a list of other URLs, shortly called 'mirrors'. Another advantage is that you can give a ratio, called 'weight', that specifies how many requests are redirected to each mirror URL. Application of the filter can be splitting the amount of requests to an overloaded site between several mirrors. Also, by specifying different weights, you can redirect more load to the mirrors with better bandwidth. Another possible putting into pracice of this filter is accessing location with complicated URL by typing something simplier, or even suppling several versions of a site, that are switched automatically.

The filter examines each incoming URL and processes it if present in the configuration. For every URL that should be redirected there is a list of corresponding mirror URLs, each with a weight. Redirector finds the mirror which is now in turn and uses it. The process of redirection itself is realized by returning HTTP error number 302 - Object Moved and sending the mirror URL in Location header. When recieving that error the browser should automatically try the returned URL.

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