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Microsoft XML Core Services

MSXML contains two classes that truly simply HTTP access, of not just XML data, but any kind of HTTP access. For instance these classes may be used to post a SOAP request, access a Web page on some Web site that returns HTML or binary data, call SQL Server 2000 XML templates or updategrams, etc.

           Tip: Read Chapter 9: Sending and Retrieving XML Data from the book XML Application Development with MSXML 4.0.

Prior to version 3.0, MSXML only provided XMLHTTP class, that is designed and well-suited for client-side HTTP access. For instance, MSXML XMLHTTP can be used from within a Web page on the client side (JScript code) to make HTTP request and update parts of that Web page. XMLHTTP is based on famous WinInet library and hence is well-suited for client side HTTP access.

           Tip: Read XML and HTTP Data Access Classes article for a details discussion on differences in XMLHTTP and ServerXMLHTTP; and alternatives to these classes. (Paid subscription to ASPToday.com required to view the complete article).

With version 3.0, MSXML introduced ServerXMLHTTP, a class designed to do server-side HTTP access. ServerXMLHTTP is based on WinHTTP, a new HTTP access component from Microsoft that is designed to be thread-safe, scalable, and UI-less. ServerXMLHTTP is really a very powerful class and can really come very handy while doing server-to-server or cross-tier HTTP data communication. Few examples where ServerXMLHTTP may be used include: calling a Web service, calling SQL Server 2000 XML template files or updategrams, calling a Web page that returns HTML/XML (if it returns HTML, you may do screen scrapping by using regular expressions and get to the data values), and so on.

       Tip: Chapter 9: (Sending and Retrieving XML Data) and Chapter 12: (Working with Data on the Client) in the book XML Application Development with MSXML 4.0 cover ServerXMLHTTP and XMLHTTP class in great details with lots of examples. perfectxml.com highly recommends this book for all MSXML developers.

       Tip: Check out Frequently Asked Questions about ServerXMLHTTP.

PerfectXML Editor's Chioce :: ServerXMLHTTP KB Articles

Let's now look at a JavaScript example illustrating use of XMLHTTP and VBScript (ASP page) example illustrating using ServerXMLHTTP:

JavaScript

<script language="JScript">
    var objXMLHTTP = new ActiveXObject("Msxml2.XMLHTTP.3.0");
    objXMLHTTP.open("GET", "http://www.perfectxml.com", false);
    objXMLHTTP.send();
    document.write(objXMLHTTP.responseText);
</script>

VBScript (ASP Page)

<%@ Language="VBScript" %>
<%
	Dim objSvrHTTP
	Dim PostData
	
	Set objSvrHTTP = Server.CreateObject("Msxml2.ServerXMLHTTP.4.0")
	objSvrHTTP.open "GET", "http://search.atomz.com/search/?sp-a=sp10009b2d&sp-q=binary", false

	objSvrHTTP.send 
	Response.Write objSvrHTTP.responseText 
%>

MSXML XMLHTTP and ServerXMLHTTP Resources Around the Web

  • MSXML HTTP Access Related KB Articles
  • SQL XML and MSXML - an alternative approach to traditional data access
  • Using XML to Improve File-Upload Processing
  • WinHTTP Proxy Configuration Utility
  • Exploring the MSXML3 ServerXMLHTTP Object
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