Keep-Alive connections. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Application Mappings Application mappings or script mappings are the Web server equivalent of file associations in Windows.
IIS performs minor preprocessing on the incoming request. Otherwise, it will return a non-zero number indicating the error code:. From the File menu, select the New command. Within the Project Name space, type validate and click ok to continue. At this point, we've got a DLL project ready to be implemented. So we have got the DllMain function implemented as follows:.
As far as you could remember, we have to implement this function in order to serve two things described before. So let's add it to our project:. So add the mentioned header file to the top of the validate. Pay a close attention, please! What's next, then? It's now time to find a way to get the query string back from IIS. In other words, if the user tries to access our validate.
WriteContext is a function to simplify the process of echoing a string to the client, implemented as follows:. This way, we don't need to pass the length of the string or other non-useful information over and over again, while echoing a string. It's counterpart, EndContext , also echoes the footer to the client:. Now set the active project configuration to Release mode and compile the program.
It is now time to see how to install and use our extension. Assuming you are running Windows , select the Internet Services Manager from the Administrative Tools of the Programs menu to bring the Internet Information Services snap-in to life.
From the left panel, navigate your way through the available leaves of the web sites to the proper directory, where you plan to use the already created extension. This is usually done in scripts directory of that dominium. For this purpose, I've created a scripts directory under the articles folder:. Right click on the scripts directory and select properties to open up the following box:. Make the necessary changes to the box, so that it looks like the above picture and then apply the changes.
Now, copy the validate. Launch your favorite web browser, and try to access the DLL, passing a number as its query string:. Please pay attention that you have to change the above-mentioned URL to match the specific needs of your dominium.
What went wrong, causing this damn page to appear?! Write script ; app. CompleteRequest ; Now I wonder why this is? I mean, I can see that what must be happening is that the last method does an actual round-trip to the client while the other methods are somehow botched up in the Http pipeline but I wonder why? April 29th, , PM 3. Quick Navigation ASP. NET Framework. How hard would it really be to port to Windows 8?
ISAPI is very low level it also is very fast, but fairly unmanageable for application level development. So, ISAPI has been mainly relegated for some time to providing bridge interfaces to other application or platforms. In fact, ASP. The content that ISAPI provides is available via common objects like HttpRequest and HttpResponse that expose the unmanaged data as managed objects with a nice and accessible interface. You can create an ISAPI filter for encryption or decryption, for logging, for request screening, or for other purposes.
They have access to all of the functionality provided by IIS. They always run on an IIS server and filter every request until they find one they need to process. Filters can be programmed to examine and modify both incoming and outgoing streams of data. Filters are initialized when the worker process is started and listens to all requests to the site on which it is installed.
Common tasks performed by ISAPI filters include: Changing request data URLs or headers sent by the client Controlling which physical file gets mapped to the URL Controlling the user name and password used with anonymous or basic authentication Modifying or analyzing a request after authentication is complete Modifying a response going back to the client Running custom processing on "access denied" responses Running processing when a request is complete Run processing when a connection with the client is closed Performing special logging or traffic analysis.
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