[OpenLayers-Users] asp.net wfs proxy...

[John Cole]

If your working with asp.net and using the WFS tools, you'll find out that
you need to proxy your WFS requests through your web server.

Below is a very (and I mean VERY) simple one.  

Add a key to your app settings to hold the WFS url (or some other way to
store it).

Use it in a layer like:

layer_wfs = new OpenLayers.Layer.WFS( "WFS Markers",
                "WFSProxy.ashx?", {typename: "somelayer"},
                { 'buffer':0, featureClass: OpenLayers.Feature.WFS});


------------------------------------------------------------

<%@ WebHandler Language="C#" Class="WFSProxy" %>

using System;
using System.Web;
using System.Net;
using System.IO;
using System.Text;
using System.Configuration;

public class WFSProxy : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/xml";
        
        context.Response.Write(_WFS(string.Format("{0}{1}",
ConfigurationManager.AppSettings["WFS_url"],
context.Request.QueryString.ToString().Replace("&amp;", "&"))));
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

    private string _WFS(string url) {
        string s = "";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

        using (HttpWebResponse response =
(HttpWebResponse)request.GetResponse()) {
            // Get the stream associated with the response.
            using (Stream receiveStream = response.GetResponseStream()) {

                // Pipes the stream to a higher level stream reader with the
required encoding format. 
                using (StreamReader sr = new StreamReader(receiveStream,
Encoding.UTF8)) {
                    s = sr.ReadToEnd();
                }

            }

            response.Close();
        }

        return s;

    }

}

There are already other proxies in the OL examples directory if you need a
cgi one.  This one could be modified to proxy WMS requests too, if you
wanted to wrap the asp.net security model around your WMS servers.

John

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10:59 PM
 
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