<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" Content="text/html; charset=Windows-1252"> <TITLE>IIS Core Functionality</TITLE> <SCRIPT LANGUAGE="JavaScript"> <!-- TempString = navigator.appVersion if (navigator.appName == "Microsoft Internet Explorer"){ // Check to see if browser is Microsoft if (TempString.indexOf ("4.") >= 0){ // Check to see if it is IE 4 document.writeln('<link rel="stylesheet" type="text/css" href="/iishelp/common/coua.css">'); } else { document.writeln('<link rel="stylesheet" type="text/css" href="/iishelp/common/cocss.css">'); } } else if (navigator.appName == "Netscape") { // Check to see if browser is Netscape document.writeln('<link rel="stylesheet" type="text/css" href="/iishelp/common/coua.css">'); } else document.writeln('<link rel="stylesheet" type="text/css" href="/iishelp/common/cocss.css">'); //--> </script> <SCRIPT LANGUAGE="VBScript"> <!-- Sub Window_OnLoad() Dim frmContents On Error Resume Next If Not Parent Is Nothing Then Set frmContents = Parent.Contents If Not frmContents Is Nothing Then frmContents.Window.TOCSynch_Click End If End If End Sub //--></SCRIPT><META NAME="DESCRIPTION" CONTENT="Internet Information Services reference information"> <META HTTP-EQUIV="PICS-Label" CONTENT='(PICS-1.1 "<http://www.rsac.org/ratingsv01.html>" l comment "RSACi North America Server" by "inet@microsoft.com <mailto:inet@microsoft.com>" r (n 0 s 0 v 0 l 0))'> <META NAME="MS.LOCALE" CONTENT="EN-US"> <META NAME="MS-IT-LOC" Content="Internet Information Services"> </HEAD> <BODY BGCOLOR="#FFFFFF" TEXT="#000000"> <H2><A NAME="_k2_iis_core_functionality"></A><SUP></SUP>IIS Core Functionality</H2> <P>IIS defines a basic functionality that you can use to build Web applications. Active Server Pages (ASP) and other Microsoft technologies have extended this basic functionality to create a rich environment for application development. The basic server functionality is exposed through the Internet Server Application Programmer Interface (ISAPI). ISAPI is described in detail in the Microsoft Platform SDK.</P> <P>The core functions which IIS provides include: <UL type=disc> <LI>Establishing and maintaining HTTP connections.</li> <LI>Reading HTTP requests and writing HTTP responses.</li> <LI>Modifying HTTP headers.</li> <LI>Obtaining client certificate information.</li> <LI>Managing asynchronous connections.</li> <LI>Mapping Uniform Resource Locators (URLs) to physical paths.</li> <LI>Managing and running applications.</li> <LI>Transmitting files.</li> </UL> <P>ASP extends this functionality by providing a link to the COM architecture and thus the other participants in Windows DNA. Similarly, you can extend the IIS architecture by defining a custom set of functions using ISAPI. The relationship between the IIS core functionality, ASP, and extended architectures is depicted in the following graphic:</P> <P><IMG SRC="/iishelp/iis/htm/asp/art/iisarch.gif" ALT="IIS Architecture" BORDER=0></P> <hr class="iis" size="1"> <p align="center"><em><a href="../../../common/colegal.htm">© 1997-2001 Microsoft Corporation. All rights reserved.</a></em></p> </BODY> </HTML>