Handling Live Web Content in WSH - Part 2 - Other Uses for XMLHttpRequest
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Right about now you’re probably asking what else you can do with the XMLHttpRequest object. Well, here are a couple of other uses for you to play around with.
object.getResponseHeader(“header”)
The XMLHttpRequest object is also able to request a website’s headers. It provides two different methods for doing this. The getAllResponseHeaders() method will return all of the headers supplied by the server. The getResponseHeader() method can be used to request a specified header only. The following example demonstrates both.
Set objxmlHTTP = CreateObject("Msxml2.XMLHTTP")
objxmlHTTP.Open "HEAD", "http://www.aspfree.com", False
objxmlHTTP.Send()
Wscript.Echo “Return all headers:”
Wscript.Echo objxmlHTTP.getAllResponseHeaders()
Wscript.Echo “Return last modified date:”
Wscript.Echo objxmlHTTP.getResponseHeader("Last-Modified")
Set objxmlHTTP = Nothing
As you can see, we’ve used the getAllResponseHeaders() method to return all of the headers and the getResponseHeader method to return the Last-Modified headers. An example output might look like this:
Return all headers:
Date: Fri, 01 Dec 2006 20:00:05 GMT
Server: Apache/1.3.34 (Unix)
Set-Cookie: sessioncookie=c88b42fa00eb0b52045e8b3ce1621c5; expires=Sat, 01-Dec-2007 20:00:05 GMT; path=/
Set-Cookie: usercookie=c88b42fa00eb0b52045e8b3ce1621c5; expires=Sat, 02-Dec-2006 08:00:05 GMT; path=/
Set-Cookie: jamcku=nilpo; expires=Sat, 01-Dec-2007 20:00:05 GMT; path=/
Set-Cookie: jamckp=8ad7de41a5d1bda96b57ff2ca0e0b697; expires=Sat, 01-Dec-2007 20:00:05 GMT; path=/
Set-Cookie: mosvisitor=1
Expires: Mon, 26 Jul 1997 05:00:00 GMT
Last-Modified: Fri, 01 Dec 2006 20:00:05 GMT
Cache-Control: no-store, no-cache, must-revalidate
Cache-Control: post-check=0, pre-check=0
Pragma: no-cache
Keep-Alive: timeout=10, max=150
Connection: Keep-Alive
Content-Type: text/html
Return last modified date:
Fri, 01 Dec 2006 20:00:05 GMT
Wipe the sweat off of your forehead and pour yourself a cold glass of tea. The hard work is done. You now have two more uses for the XMLHttpRequest object as well as some good methods for error-handling when using it. That’s it for now. I’ll catch you next time. Until then, keep on coding!
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