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Question

Detect ASP.NET version from output HTML?

Answer 1

+1 A:

There is nothing guaranteed to be output that will indicate what you're looking for.

This is especially true since you can create HTTP handlers that will output anything you want.

Andy West 2010-02-02 00:53:14

Andy's correct, my current project's headers indicate the site's powered by Pure Evil.

Nick Craver 2010-02-02 00:54:45

well, im not necessarily talking about a guarantee. just something that tends to get rendered one way in 2.0, and another way in 3.5. anything at all really.

LoveMeSomeCode 2010-02-02 00:57:54

@LoveMeSomeCode - There's nothing different in that respect, there's MORE stuff, but nothing was replaced from 2.0 to 3.5, it's all the 2.0 CLR, and most of the web controls are from the original 2.0 release.

Nick Craver 2010-02-02 00:59:15

Perhaps if you tell us what you're trying to accomplish we can help you better. I can't think of why this information would be useful.

Andy West 2010-02-02 01:02:20

"I can't think of why this information would be useful" - this was probably my motivation behind the 'trivia' tag.

LoveMeSomeCode 2010-02-02 01:56:25

Answer 2

+1 A:

No. The HTTP headers are configurable by admins, so they are unreliable. For instance stackoverflow.com says:

Server: Microsoft-IIS/7.5

MSN.com says:

X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727

and 37signals.com says:

X-Powered-By: PHP/5.3.0

And anyone can make any php site respond that is powered by ASP.Net 3.5 or claim that is a perl script when in fact is a ASP site. At the end of they day, HTTP is just text and all the headers are configurable by someone knowledgeable, and they mean little to nothing from a trust perspective.

Remus Rusanu 2010-02-02 01:02:24

That's what I was looking for. I should have clarified that I wasn't looking for a foolproof solution or expecting someone to try something deceptive with the headers. The X-Powered-By in Firefoxes WebDeveloper Add-in gives me exactly what I was looking for. Thanks!

LoveMeSomeCode 2010-10-28 18:14:11

Answer 3

A:

There is no such thing as ASP.NET 3.5. Only 2.0 (and soon, 4.0).

Keep in mind that .NET 3.5 is just some extra assemblies on top of some .NET 2.0 service packs. There is no new CLR, hence, no new ASP.NET version.

John Saunders 2010-02-02 01:04:34

I'm not so sure about that. After all, Microsoft has published a book called "Microsoft® ASP.NET 3.5 Step by Step". I know what you're trying to say, though.

Andy West 2010-02-02 01:10:23

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Detect ASP.NET version from output HTML?

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