HttpHandlers and HttpModules

Re: How to Add header variables to HttpResponse object

docluv — Thu, 07 Aug 2008 20:34:50 GMT

Even if you set a break point in the code you cannot step through it? You do realize you need to create your own map of URLs that need to return a 301 redirect header right? This is just an example to give you the basic framework and idea. You need to somehow do your own URLs.

Re: How to Add header variables to HttpResponse object

287867 — Thu, 07 Aug 2008 18:42:40 GMT

Hi Chist,

I did registered the module in the Web.Config but it does not work either. Let me say something, I have IIS version 5.1, I running on Windows XP and I have no idea if it can affect the code generated.

Do you have any other way to add to add headers to the response.

Thank you very much,
Armando

Re: How to Add header variables to HttpResponse object

docluv — Wed, 06 Aug 2008 22:25:24 GMT

This is a custom httpModule, did you register the module in your web.config?

How to Add header variables to HttpResponse object

287867 — Tue, 05 Aug 2008 23:46:06 GMT

Hello,

I tried the example you typed but it did not work for me. That's exactly what I want to do, just add header variables to a HttpResponse object in order to when this get the destination my header variable is added to the pipeline.

Could you please send me a more complete example?

Thanks very much in advance

Armando

Re: How to build http request and add a header to the heder collection

docluv — Tue, 05 Aug 2008 16:28:55 GMT

You need to register an event handler with one of the ASP.NET pipeline events, I think in this case like AuthenticateRequest or somewhere in there. Then your event handler will execute your code to do the 301 redirect.

Imports Microsoft.VisualBasic

Public Class _301RedirectModuleInherits ExBaseModule

Public Overrides Sub Dispose()

MyBase.Dispose()

End Sub

Public Overrides Sub Init(ByVal context As System.Web.HttpApplication)

MyBase.Init(context)

AddHandler context.AuthorizeRequest, AddressOf Process301

End Sub

Public Sub Process301(ByVal sender As Object, ByVal e As EventArgs)

Dim app As HttpApplication = CType(sender, HttpApplication)

Dim ht As Hashtable = Get301Mappings()Dim sPath As String = _

app.Context.Request.AppRelativeCurrentExecutionFilePath

If Not IsNothing(ht(sPath)) Then

app.Response.StatusCode = 301 ' make a permanent redirect

app.Response.AddHeader("Location", ht(sPath).ToString)

app.Response.End()

End If

End Sub

Private Function Get301Mappings() As Hashtable

Dim ht As New Hashtable

ht.Add("~/aboutcompany.htm", "history.aspx")

ht.Add("~/default.htm", "default.aspx")

ht.Add("~/Dallas.aspx", "Texas.aspx")

ht.Add("~/Chrysler.aspx", "Mercedes.aspx")

Return ht

End Function

End Class

Re: How to build http request and add a header to the heder collection

287867 — Tue, 05 Aug 2008 12:02:32 GMT

Hello,

Thanks for your answer I just did that, and I also registered the module in the Web.config, when I run the code the following error comes out:

Error Line: --------- Dim headers As NameValueCollection = response.Headers
Error Description-- This operation requires IIS integrated pipeline mode.

At the end of my message I paste the portion of my code for you to see.

I try also with: response.AddHeader("variable","value") and it do not send the header in the response.

Thanks very much in advance for your help

Armando

-----Code ----

Public Class MyHttpHandler
Implements IHttpModule

Public Sub Init(ByVal application As HttpApplication) Implements IHttpModule.Init
AddHandler application.BeginRequest, AddressOf Me.OnInit
End Sub

' event handler.

Private Sub OnInit(ByVal [source] As [Object], ByVal e As EventArgs)
Dim application As HttpApplication = CType([source], HttpApplication)
Dim response As HttpResponse = application.Context.Response

Dim headers As NameValueCollection = response.Headers

Dim t As Type = headers.GetType Dim p As PropertyInfo = t.GetProperty("IsReadOnly", BindingFlags.Instance Or BindingFlags.IgnoreCase Or BindingFlags.NonPublic Or BindingFlags.FlattenHierarchy)

p.SetValue(headers, False, Nothing)
headers.Add("USER_VAR", "MyName")

End Sub

Public Sub Dispose() Implements IHttpModule.Dispose
End Sub End Class

Re: How to build http request and add a header to the heder collection

sandeepbhutani304 — Sat, 02 Aug 2008 08:37:20 GMT

u can add a HttpModule to trap the request and make the changes and forward request again

How to build http request and add a header to the heder collection

287867 — Fri, 01 Aug 2008 19:19:27 GMT

Hello everyone,

Could you please help me with this issue it is urgent.
I am traying to call a page http://www.whatevers.com but I need to build the request and to add some new values to the header collection because this servers need that value in the request.
I want that once the request is made the browser jumps directly to that url too

Could you help me with this

Thanks in advance

Armando