Extensions and filters are compiled into dll files to run on servers. There are some benefits of app domain which are as follows:- Consider two applications, if fault occurs in one application it will not affect other applications. Individual applications can be stopped without interrupting the entire process. Managing permissions to code can be controlled by app domain in which the code is running.
App Domain provides Application Security. Fig-2 represents an App Domain. Server certificate is a must and client certificate is optional only when the server requests it. A certificate is like something to prove who you are and it also contains a public key for asymmetric encryption.
Using asymmetric encryption with public key in the server certificate to establish a shared symmetric keywhich is used to transfer data between client and server securely by symmetric encryption for performance reason because symmetric encryption is faster than asymmetric encryption. The shared symmetric key is established by exchanging a premaster secret from client side encrypted with server public key and is derived from the pre-master secret together with client random and server random.
HTTP is not encrypted and is vulnerable to man-in-the-middle and eavesdropping attacks, which can let attackers gain access to website accounts and sensitive information, and modify webpages to inject malware or advertisements. HTTPS is designed to withstand such attacks and is considered secure against them with the exception of older, deprecated versions of SSL. Fig-3 represents work of Https using SSLs. These are also known as server clusters.
Web farms provides high availability, if any of the servers goes down, load balancer redirects request to other servers. These are used in enterprise environments which enhances the performance of the entire system. In a web farm two or more webservers consist of same kind of contents which are of same configuration. Web Farm Framework includes some built-in management infrastructure that allows you to check on the health of a server, and track its status. Web Farm uses the Microsoft Web Deploy technology to enable application deployment in an automated fashion.
Fig-4 represents a web farm. It prevent the use of session state in the process. So in state full application you have another performance penalty to serialize the state to an external store. Fig-5 represents a Web Garden. Network Load Balancing Network load balancing is a service for windows server.
It acts as a single point of contacts for clients. It gives a common virtual machine name to all the web servers present in an organization. Suppose if 10 machines are used in NLB then all the 10 machines would have the same virtual name and all of them share the load. It sends a new request to server with the least load.
It can handle millions of request per second. It distributes network traffic among multiple servers or virtual machines within a cluster to avoid overloading any one host and improve performance. NLB allows all of the computers in the cluster to be addressed by the same set of cluster IP addresses, and it maintains a set of unique, dedicated IP addresses for each host.
It helps to detect and recover from a cluster host that fails or goes offline. Balances the network load when hosts are added or removed. CMainFrame Class. Delete the OnCreate. This function added manually. Add the following include directive to MainFrm. Add the message map manually. CMyex34cApp Class. Add the following code after the InitInstance. AfxEnableControlContainer ;. Add the following code just after the AddDocTemplate. EnableShellOpen ;. CMyex34cDoc Class. Figure Adding SaveModified virtual function.
Then, edit the code as shown below. Change the following message map:. CMyex34cView Class. Figure Adding Windows message, command and update commands. Edit the code for the implementation part as shown below. CMenu menu;. SetSel 0, -1 ;. Clear ;. The following is the output. The Story of The Display Program. The display program, myex34c. This function just relays the text to the view. For IIS 1. A global filter is installed for the entire IIS service and sees requests for all Web sites.
A site filter is installed at the site level and sees requests only for the site where it is installed. Right-click the level icon that you selected for this example, we have to choose the global level. Figure Invoking the Properties page of the Web site.
Figure Entering the filter properties. Figure Restarting the IIS. Repeat the previous step for any other services that were stopped in step 11 if needed. You should see a green arrow that is pointing up under the Status column. Normally Sspifilt.
If your ISAPI filter failed to load, you may try removing the added filter and re-add the filter in the Debug directory of the project directly as shown below. This happens mostly because of the version of function library used in the source code not compatible with Windows operating system version. Figure Using the debug version of the filter DLL. There's one more thing to do. When you use the browser to retrieve pages from the server, you should see output something like this.
Further reading and digging:. IIS 6. Win32 process, thread and synchronization story can be found starting from Module R. Microsoft Open Specification Documentation.
HttpFilterProc is called for every object requested by the client, regardless of whether it is an image, a html file or an ASP script. TerminateFilter is called when the web server is shuting down. Use this function to free resources reservered, etc. Because a filter is invoked on every request, you have to register the filter for every event you want to handle.
Events, the filter does not register for, are not sent to it, thus increasing the speed of the filter. This filter does not respect some aspects of good programming, like loading setup information, but rather has them written directly into the code - this one is left for you. Therefore, you have to take care of this fact within your code. Sujay Ghosh Sujay Ghosh 2, 6 6 gold badges 27 27 silver badges 40 40 bronze badges.
What you say "talk to an ASP. NET application" what do you intend to do? Add a comment. Active Oldest Votes. I know of them. Some drawbacks include slower execution of course managed code will be slower than unmanaged, but without all the other headaches of unmanaged code and the inability for classic ASP applications to interact with your module. If you need to integrate classic ASP with.
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