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How to use a custom HTTP header to get the client remote IP address? #1950


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alper created
Support Team Director

My website is behind a proxy server / load balancer and the client ip is passed in a custom HTTP header. To get the Identity Server work, we need to use the custom HTTP header. The client IP is stored in X-Original-Host HTTP header.


1 Answer(s)
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    alper created
    Support Team Director

    Create the below extension class in your web project. Set the ForwardedHeaderName to whatever HTTP header the real IP address is in.

    public static class ApplicationBuilderExtensions
    {
        public static IApplicationBuilder UseCustomHttpHeaders(this IApplicationBuilder builder)
        {
            var options = new ForwardedHeadersOptions
            {
                ForwardedForHeaderName = ForwardedHeadersDefaults.XOriginalHostHeaderName,  //"X-Original-Host"
                ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
            };
    
            options.KnownNetworks.Clear();
            options.KnownProxies.Clear();
    
            return builder.UseForwardedHeaders(options);
        }
    }
    

    Open your web module class.

     public override void OnApplicationInitialization(ApplicationInitializationContext context)
    {
        var app = context.GetApplicationBuilder();
        var env = context.GetEnvironment();
    
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseCustomHttpHeaders();
        }
        else
        {
            app.UseErrorPage();
            app.UseCustomHttpHeaders();
            app.UseHsts();
    
            app.UseAllElasticApm(context.GetConfiguration());
        }
    
        //...
    

    Create a simple controller to test it.

    public class Test : Controller
    {
        public string Index()
        {
            return "Client IP Address: " + HttpContext.Connection.RemoteIpAddress.ToString();
        }
    }
    

    Open Postman and make a GET request to TestController

    PS: If you want to use X-Forwarded-For header, then remove ForwardedForHeaderName = "X-Original-Host" .

    References:

    • https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/proxy-load-balancer
    • https://github.com/IdentityServer/IdentityServer4/blob/main/src/IdentityServer4/src/Endpoints/DiscoveryEndpoint.cs#L53
    • https://github.com/IdentityServer/IdentityServer4/blob/main/src/IdentityServer4/src/Extensions/HttpContextExtensions.cs#L108
    • https://github.com/IdentityServer/IdentityServer4/blob/main/src/IdentityServer4/src/Extensions/HttpContextExtensions.cs#L88
Made with ❤️ on ABP v9.1.0-preview. Updated on December 10, 2024, 06:38