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• How To Obtain The Name Of The Client From The ASP Server

  Here's a question about client side vs. server side scripting that I got recently: I want to get the machine name of the client the request is being made from. With ASP I can get the IP address using this code: ipaddr = Request.ServerVariables("REMOTE_ADDR") Read More... Posted Monday, May 09, 2005 12:18 PM by Eric Lippert | 12 Comments Filed under: Scripting, Security, ASP, Performance

• What's the Difference between WScript.CreateObject, Server.CreateObject and CreateObject?

  A reader asked me last week I have always used Server.CreateObject in ASP scripts and WScript.CreateObject in WSH scripts, because I was unable to find any *convincing* information on the subject and therefore assumed that they were there to be used, Read More... Posted Tuesday, June 01, 2004 11:49 AM by Eric Lippert | 19 Comments Filed under: JScript, VBScript, Scripting, ASP

• VBScript and JScript Don't Mix, at least in ASP

  A reader wrote me recently to describe a problem that I used to hear fairly often: I write ASP code using VBScript and a coworker of mine uses JScript. We were wondering if we could combine our code in ASP. However, it does not seem to be working right. Read More... Posted Thursday, February 19, 2004 10:48 AM by Eric Lippert | 14 Comments Filed under: Scripting, ASP

• The Tragedy of Thread Happiness Disease

  A JOS reader interested in developing server software asked recently Is it possible to determine the number of concurrent threads a server can support from the server's specification? Now, as I've said before , I'm no expert on performance tuning multi-threaded Read More... Posted Sunday, February 15, 2004 11:46 AM by Eric Lippert | 9 Comments Filed under: ASP, Performance

• Speeding Can Slow You Down

  I hope all you readers living in the United States had a restful and enjoyable Thanksgiving holiday. I sure did. I've been meaning to talk a bit about some of the performance issues you run into when tuning massively multi-threaded applications, like Read More... Posted Monday, December 01, 2003 2:35 PM by Eric Lippert | 1 Comments Filed under: ASP, Performance

• Eval is Evil, Part Two

  As I promised, more information on why eval is evil. (We once considered having T-shirts printed up that said "Eval is evil!" on one side and "Script happens!" on the other, but the PM's never managed to tear themselves away from their web browsing long enough to order them.) Read More... Posted Tuesday, November 04, 2003 2:23 PM by Eric Lippert | 4 Comments Filed under: JScript, Scripting, Security, ASP, Performance

• Global State On Servers Considered Harmful

  The other day I noted that extending the built-in objects in JScript .NET is no longer legal in "fast mode". Of course, this is still legal in "compatibility mode" if you need it, but why did we take it out of fast mode? Read More... Posted Wednesday, October 29, 2003 2:25 PM by Eric Lippert | 5 Comments Filed under: JScript .NET, Scripting, ASP

• Arrrrr! Cap'n Eric be learnin' about threadin' the harrrrd way

  Arr! When I was a young swabbie seven years ago I was given the task of implementing the Scripting.Dictionary object, and I didn't yet understand all the stuff I just told you maties about threading. Mayhem followed! Read More... Posted Friday, September 19, 2003 1:00 PM by Eric Lippert | 11 Comments Filed under: Scripting, COM Programming, ASP, Performance

• Why is it a bad idea to put script objects in Session scope?

  Every so often some ASP coder out there tries to put a JScript or VBScript object into the Session (or Application) object. Things usually start going horribly wrong shortly thereafter -- either terrible performance ensues or things just break outright. Well, like Groucho says, if it hurts when you do that, don't do that! Understanding why this is a bad idea will take us yet deeper into the land of threading models. Read More... Posted Thursday, September 18, 2003 10:35 PM by Eric Lippert | 7 Comments Filed under: JScript, VBScript, Scripting, COM Programming, ASP, Performance

• How does Active Server Pages use the script engines?

  It's always struck me as a little bit odd that Active Server Pages, a web server, encourages developers to use VBScript and JScript to write server-side scripts. I mean, the whole point of a web server is that it produces complex strings as blindingly fast as possible, on demand. "Blindingly fast" and "script language" do not really go together... Read More... Posted Thursday, September 18, 2003 5:32 PM by Eric Lippert | 7 Comments Filed under: Scripting, ASP, Performance