diff --git a/Extensions.Microsoft.Http/src/AddDefaultRequestHeaderHttpClientBuilderExtensions.cs b/Extensions.Microsoft.Http/src/AddDefaultRequestHeaderHttpClientBuilderExtensions.cs
new file mode 100644
index 0000000..34a4dfd
--- /dev/null
+++ b/Extensions.Microsoft.Http/src/AddDefaultRequestHeaderHttpClientBuilderExtensions.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Extensions.Microsoft.Http;
+
+public static class AddDefaultRequestHeaderHttpClientBuilderExtensions
+{
+    public static IHttpClientBuilder AddDefaultRequestHeader(this IHttpClientBuilder builder, string name, string? value)
+        => builder.ConfigureHttpClient((serviceProvider, client) => client.DefaultRequestHeaders.Add(name, value));
+
+    public static IHttpClientBuilder AddDefaultRequestHeader(this IHttpClientBuilder builder, string name, Func<IServiceProvider, string?> configureValue)
+        => builder.ConfigureHttpClient((serviceProvider, client) =>
+        {
+            var value = configureValue(serviceProvider);
+            client.DefaultRequestHeaders.Add(name, value);
+        });
+
+    public static IHttpClientBuilder AddDefaultRequestHeader(this IHttpClientBuilder builder, string name, IEnumerable<string?> values)
+        => builder.ConfigureHttpClient((serviceProvider, client) => client.DefaultRequestHeaders.Add(name, values));
+
+    public static IHttpClientBuilder AddDefaultRequestHeader(this IHttpClientBuilder builder, string name, Func<IServiceProvider, IEnumerable<string?>> configureValues)
+        => builder.ConfigureHttpClient((serviceProvider, client) =>
+        {
+            var values = configureValues(serviceProvider);
+            client.DefaultRequestHeaders.Add(name, values);
+        });
+}
diff --git a/Extensions.Microsoft.Http/src/ConfigureHttpClientServiceCollectionExtensions.cs b/Extensions.Microsoft.Http/src/ConfigureHttpClientServiceCollectionExtensions.cs
index 9f8cab9..5921b2d 100644
--- a/Extensions.Microsoft.Http/src/ConfigureHttpClientServiceCollectionExtensions.cs
+++ b/Extensions.Microsoft.Http/src/ConfigureHttpClientServiceCollectionExtensions.cs
@@ -19,13 +19,41 @@ public static IHttpClientBuilder ConfigureHttpClient<TClient, TOptions>(this ISe
         return builder;
     }
 
+    public static IHttpClientBuilder ConfigureHttpClient<TClient, TImplementation, TOptions>(this IServiceCollection services)
+        where TClient : class
+        where TImplementation : class, TClient
+        where TOptions : HttpClientOptions
+    {
+        var clientName = typeof(TClient).Name;
+
+        services.ConfigureOptionsFromConfiguration<TOptions>(clientName);
+
+        var builder = services.AddHttpClient<TClient, TImplementation>((serviceProvider, client)
+            => ConfigureHttpClient<TOptions>(serviceProvider, client, clientName));
+
+        return builder;
+    }
+
+    public static IHttpClientBuilder ConfigureHttpClient<TClient, TImplementation, TOptions>(this IServiceCollection services, string name)
+        where TClient : class
+        where TImplementation : class, TClient
+        where TOptions : HttpClientOptions
+    {
+        services.ConfigureOptionsFromConfiguration<TOptions>(name);
+
+        var builder = services.AddHttpClient<TClient, TImplementation>(name, (serviceProvider, client) => 
+            ConfigureHttpClient<TOptions>(serviceProvider, client, name));
+
+        return builder;
+    }
+
     public static IHttpClientBuilder ConfigureHttpClient<TClient, TOptions>(this IServiceCollection services, string name)
         where TClient : class
         where TOptions : HttpClientOptions
     {
         services.ConfigureOptionsFromConfiguration<TOptions>(name);
 
-        var builder = services.AddHttpClient<TClient>(name, (serviceProvider, client) => 
+        var builder = services.AddHttpClient<TClient>(name, (serviceProvider, client) =>
             ConfigureHttpClient<TOptions>(serviceProvider, client, name));
 
         return builder;