Question : How can I get a basic working AJAX Cross Site Proxy in C#?

I'm looking for a working AJAX proxy to use to send and receive API requests/responses to http://ww1.caliber.ie/cram/api

I have the clientside code from Caliber (attached) that gives an example of how their API is used but can't get it working till I get a working proxy. I've read alot articles and ebooks. I've taken code from http://www.codeproject.com/KB/ajax/ajaxproxy.aspx (Example below) but can't get it to work. I get a missing assembly error for "using ProxyHelpers;" when I have it in a .ashx file.

I'm not sure how to go about writing my own are even altering this one. I don't know if it should be in a .aspx, .ashx or .asmx file.

Can anyone help me get this proxy attached working?
or
Can anyone point me to a working C# AJAX proxy?

I have a high level understanding of what's going on but keep getting lost when I get down into the coding of the process.
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Proxy.ashx:
 
<%@ WebHandler Language="C#" Class="proxy" %>
 
using System;
using System.Web;
using System.Web.Caching;
using System.Net;
using ProxyHelpers;
 
public class RegularProxy : IHttpHandler {
        
    public void ProcessRequest (HttpContext context) {
        string url = context.Request["url"];
        int cacheDuration = Convert.ToInt32(context.Request["cache"]?? "0");
        string contentType = context.Request["type"];
 
        // We don't want to buffer because we want to save memory
        context.Response.Buffer = false;
 
        // Serve from cache if available
        if (context.Cache[url] != null)
        {
            context.Response.BinaryWrite(context.Cache[url] as byte[]);
            context.Response.Flush();
            return;
        }
        using (WebClient client = new WebClient())
        {
            if (!string.IsNullOrEmpty(contentType))
                client.Headers["Content-Type"] = contentType;
            
            client.Headers["Accept-Encoding"] = "gzip";
            client.Headers["Accept"] = "*/*";
            client.Headers["Accept-Language"] = "en-US";
            client.Headers["User-Agent"] = 
                   "Mozilla/5.0 (Windows; U; Windows NT 6.0; " + 
                   "en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6";
            
            byte[] data = client.DownloadData(url);
 
            context.Cache.Insert(url, data, null,
                        Cache.NoAbsoluteExpiration,
                        TimeSpan.FromMinutes(cacheDuration),
                        CacheItemPriority.Normal, null); 
            
            if (!context.Response.IsClientConnected) return;
 
            
            // Deliver content type, encoding and length
            // as it is received from the external URL
            context.Response.ContentType = 
                    client.ResponseHeaders["Content-Type"];
            string contentEncoding = 
                   client.ResponseHeaders["Content-Encoding"];
            string contentLength = 
                   client.ResponseHeaders["Content-Length"];
 
            if (!string.IsNullOrEmpty(contentEncoding))
                context.Response.AppendHeader("Content-Encoding", 
                                              contentEncoding);
            if (!string.IsNullOrEmpty(contentLength))
                context.Response.AppendHeader("Content-Length", 
                                              contentLength);
 
            if (cacheDuration > 0)
                HttpHelper.CacheResponse(context, cacheDuration);
            
            // Transmit the exact bytes downloaded
            context.Response.BinaryWrite(data);
        }
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }
 
}
 
End Proxy.ashx
 
Default2.aspx:
 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
 

 


    XML Test
    

 

    
        

        
		
        

        

        
		
        
    


 
End Default2.aspx
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Answer : How can I get a basic working AJAX Cross Site Proxy in C#?

It seems that your web app was not able to find the DLL for ProxyHelpers. Have you copied the ProxyHelpers.dll (downloaded from the codeproject article) into your web app's /bin folder?
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