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| Active Server Pages (ASP) | |
|---|---|
| Developer | Microsoft |
| Stable release | 3.0 / February 17, 2000; 25 years ago (2000-02-17) |
| Type | Web application framework |
| License | Proprietary software |
| Website | www |
| Active Server Pages | |
|---|---|
| Filename extension | .asp |
| Developed by | Microsoft |
Active Server Pages (ASP) isMicrosoft's firstserver-sidescripting language and engine fordynamic web pages.
It was first released in December 1996, before being superseded in January 2002 byASP.NET.
Initially released as an add-on toInternet Information Services (IIS) via theWindows NT 4.0 Option Pack (1996), it is included as a component ofWindows Server (since the initial release ofWindows 2000 Server). There have been three versions of ASP, each introduced with different versions of IIS:
ASP 2.0 provides six built-inobjects: Application, ASPError, Request, Response, Server, and Session. ASession object, for example, represents asession that maintains the state ofvariables from page to page.[1] TheActive Scripting engine's support of theComponent Object Model enables ASPwebsites to access functionality in compiledlibraries such asdynamic-link libraries.
ASP 3.0 does not differ greatly from ASP 2.0 but it does offer some additional enhancements such as Server.Transfer method, Server.Execute method, and an enhanced ASPError object. ASP 3.0 also enables buffering by default and optimized the engine for better performance.
ASP was supported until 14 January 2020 onWindows 7.[2] The use of ASP pages will be supported onWindows 8 for a minimum of 10 years from the Windows 8 release date.[2] ASP is supported in all available versions of IIS as of 2025.[3]
ASP usesscripting on the server to generate content that is sent to the client's web browser via HTTP response. The ASP interpreter reads and executes all script code between <% and %> tags, the result of which is content generation. These scripts were written usingVBScript,JScript, orPerlScript. The@Language directive, the<script language="language" runat="server" /> syntax or server configuration can be used to select the language. In the example below, Response.Write Now() is in anHTML page; it would be dynamically replaced by the current time of the server.
| Server side | Client Side |
|---|---|
Theserver'scurrenttime:<%Response.WriteNow()%> | The server's current time:8/11/2015 6:24:45 PM |
Web pages with the.aspfilename extension use ASP, although some web sites disguise their choice of scripting language for security purposes by using the more common.htm or.html extensions. Pages with the.aspx extension use compiledASP.NET; however, ASP.NET pages may still include some ASP scripting. The introduction of ASP.NET led to use of the termClassic ASP for the original technology.
Sun Java System ASP (formerly ChiliSoft ASP) was a popular and reportedly complete emulator,[4] but it has been discontinued.
Stores variables accessible only to a single visitor, which are local variables.
<%IfLen(Request.QueryString("name"))>0ThenSession("name")=Request.QueryString("name")EndIfResponse.Write"Welcome "&Server.HTMLEncode(Session("name"))&"!"%>
The session object is file based and multiple concurrent read and/or write requests will be blocked and processed in turn.
