Making Http Request From Code Behind

Mar 3, 2011

I am trying to implement Message API

I am not sure how I will be calling this from code-behind and in their snippet it says:


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Clue: undefined makes me think that there's JS involved.

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excuse me for the underlines, i thought that would make my query stand out.

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All I need is to send a http post request I pulled from fiddler.

I do not want to use HttpWebRequest class. It makes it hard to set up a request, does not allow to change host,

and when it does send it it looks nothing like the request I want. The server is very sensitive and unless I copy the request headers 100% it will return an empty page. Why can't I just type in the headers and send it that way? What would be 5 minutes of
work in php is taking the whole evening in

This is what I am trying to send, simple as it gets: ...

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How To Ignore A Http Request Without Clearing The Browser

Mar 24, 2010

To prevent duplicate requests (i.e. pressing F5 right after clicking a command button), I've setup my page base class to ignore the request if it's detected as a duplicate.

When I say 'ignore' I mean Response.End()

Now I thought I've seen this work before, where there's an issue, I just Response.End() and the users page just does nothing. I don't know the exact circumstance in which this worked, but I'm unable to repeat it now.

Now when I call Response.End(), I just get an empty browser. More specifically, I get this html.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<META http-equiv=Content-Type content="text/html; charset=utf-8"></HEAD>

I setup the following test app to confirm the problem is not elsewhere in my app. Here it is:

Add the following to an aspx form

<asp:Label ID="lbl" Text="0" runat="server" /><br />
<asp:Button ID="btnAdd1" Text="Add 1" runat="server" /><br />
<asp:Button ID="btnAdd2" Text="Add 2" runat="server" /><br />
<asp:Button ID="btnAdd3" Text="Add 3" runat="server" /><br />

And here's the code behind file

using System;

namespace TestDupRequestCancellation
public partial class _Default : System.Web.UI.Page
protected void Page_Init(object sender, EventArgs e)
btnAdd1.Click += btnAdd1_Click;
btnAdd2.Click += btnAdd2_Click;
btnAdd3.Click += btnAdd3_Click;
protected void Page_Load(object sender, EventArgs e)
if (!IsPostBack)
CurrentValue = 0;
else if (Int32.Parse(lbl.Text) != CurrentValue)
protected void Page_PreRender(object sender, EventArgs e)
lbl.Text = CurrentValue.ToString();
protected int CurrentValue
return Int32.Parse(Session["CurrentValue"].ToString());
Session["CurrentValue"] = value.ToString();
void btnAdd3_Click(object sender, EventArgs e)
CurrentValue += 3;
void btnAdd2_Click(object sender, EventArgs e)
CurrentValue += 2;
void btnAdd1_Click(object sender, EventArgs e)
CurrentValue += 1;

When you load the page, clicking any button does what is expected, but if you press F5 at any time after pressing one of the buttons, it will detect it as a duplicate request and call Response.End() which promptly ends the task. Which leaves the user with an empty browser.

Is there anyway to leave the user with the page as it was, so they can just click a button?

Also; please note that this code is the simplest code I could come up with to demonstrate my problem. It's not meant to demonstrate how to check for dup requests.

EDIT: Another change that will allow me to achieve the same results would be to disable all my event handlers.

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C# - How To Raw Http Request That The HttpWebRequest Class Sends

Sep 27, 2010

I know you are all going to answer "use a debugging proxy server like Fiddler" but it's not that simple.

Here's my situation: I have some code that runs on a server, in an ASP.NET page code-behind (aspx.cs), which (among other things) establishes a connection to another server, grabs some stuff, and then formats it and returns it to the browser.

The problem is that the other server is doing the wrong thing, and so I want to be able to pass a debugging flag into the page (via the query string, e.g. ?debug=true) so that it will print out the completely raw HTTP request that it is sending to the other server so I can see what the heck is wrong. This code is running in several places so I want to be able to just pass in this flag on dev, staging, or production and just see the request, without having to figure out whether the production servers can talk to some proxy server that exists somewhere, etc.

You would think that it would be easy to do this, right? So I feel like I'm crazy or something but I looked at the reference for HttpWebRequest and its parent class WebRequest and -- nothing. No can do. You would think Microsoft would have thought of this. The closest thing is that you can access the "Headers" collection but when I tried it, it omitted some really important headers like "content length" -- so it must be "lying" to me (I know it's lying, because I know for a fact that the remote server is returning a 200 status -- the request is successful, it's just returning bad/different/wrong data)

Here is the asked-for code example:

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("");
req.Method = ... whatever ...;
... other setup for the request ...
/* At this point we are about to send the request.
What does the raw HTTP request look like? */
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

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