Send Out XHTML to Browsers That Support It

A while ago I saw this useful tip to instruct an ASP.NET 2.0 application to send the response as valid XHTML / XML.
It's as simple as adding the following to your Global class / global.asax file:
Sub Application_PreSendRequestHeaders(ByVal o As Object, _
        ByVal e As EventArgs)
If Array.IndexOf(Request.AcceptTypes, "application/xhtml+xml") > -1 Then Response.ContentType = "application/xhtml+xml" End If End Sub C# protected void Application_PreSendRequestHeaders(Object o, EventArgs e) { if (Array.IndexOf(Request.AcceptTypes, "application/xhtml+xml") > -1) { Response.ContentType = "application/xhtml+xml"; } }

This way, browsers that support it (like FireFox) get the page served as XHTML / XML, while other browsers (like IE), get it as plain HTML.

You can read the full details in the XHTML and MIME Types section of the article "Building ASP.NET 2.0 Web Sites Using Web Standards" at the MSDN site.

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Written by Imar Spaanjaars
Date Posted 05/23/2006 19:35


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