How to setup Custom HttpModule

Sometimes you need to execute your code using early in the page lifecycle then you can use HttpModules

add to module web.config

 <add name="HttpCustomRequest" preCondition="managedHandler" type="Centralpoint.WebSite.HttpModules.Custom.HttpCustomRequest" />

Then copy the code into HttpModules.cs file and move that file into Root/App_code/Custom directory

using System;
using System.Collections.Generic;
using System.Web;

namespace Centralpoint.WebSite.HttpModules.Custom
{
    public class HttpCustomRequest : IHttpModule
    {
        public void Init(HttpApplication application)
        {
            application.BeginRequest += new EventHandler(this.OnBeginRequest);
        }

        public void Dispose()
        {
        }

        public void OnBeginRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            HttpContext context = application.Context;
            string url = context.Request.Url.ToString();

            if(!url.StartsWith("http://245.643.136.178") || !url.StartsWith("https://255.143.136.178"))
                return;

            HttpContext.Current.Trace.Warn("application.Context.Request", $"URL: {url}  Path: {context.Request.Path}");
            //HttpContext.Current.Trace.Warn("context.Request.Url.Host", $" {context.Request.Url.Host}");
            //HttpContext.Current.Trace.Warn("context.Request.Url.Authority", $" {context.Request.Url.Authority}");
            //HttpContext.Current.Trace.Warn("context.Request.Url.AbsolutePath", $" {context.Request.Url.AbsolutePath}");
            //HttpContext.Current.Trace.Warn("context.Request.Url.Scheme", $" {context.Request.Url.Scheme}");
            switch (url.ToLower())
            {
                case "http://155.643.136.178/shc":
                case "https://194.143.136.178/shc":
                    HttpContext.Current.Trace.Warn("Custom.Module.OnBeginRequest", "redirect");
                    context.Response.Redirect("https://myWebsite.org/shc", true);
                    break;
                case "http://155.643.136.178/e-w":
                case "https://194.143.136.178/e-w":
                    HttpContext.Current.Trace.Warn("Custom.Module.OnBeginRequest", "redirect");
                    context.Response.Redirect("https://myWebsite.com", true);
                    break;
                case "http://155.643.136.178/pga-golf":
                case "https://194.143.136.178/pga-golf":
                    HttpContext.Current.Trace.Warn("Custom.Module.OnBeginRequest", "redirect");
                    context.Response.Redirect("https://myWebsite.com", true);
                    break;
                default:
                    HttpContext.Current.Trace.Warn("Custom.Module.OnBeginRequest", $"Not trackable URL: {url}");
                    break;
            }
        }
    }
}

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