diff --git a/Http11Probe.slnx b/Http11Probe.slnx
index 21fa1cd..c088d0f 100644
--- a/Http11Probe.slnx
+++ b/Http11Probe.slnx
@@ -13,5 +13,6 @@
     <Project Path="src/Servers/SimpleWServer/SimpleWServer.csproj" />
     <Project Path="src/Servers/SiskServer/SiskServer.csproj" />
     <Project Path="src/Servers/ServiceStackServer/ServiceStackServer.csproj" />
+    <Project Path="src/Servers/EffinitiveServer/EffinitiveServer.csproj" />
   </Folder>
 </Solution>
diff --git a/docs/content/servers/effinitive.md b/docs/content/servers/effinitive.md
new file mode 100644
index 0000000..1cf0e50
--- /dev/null
+++ b/docs/content/servers/effinitive.md
@@ -0,0 +1,178 @@
+---
+title: "Effinitive"
+toc: false
+breadcrumbs: false
+---
+
+**Language:** C# · [View source on GitHub](https://github.com/MDA2AV/Http11Probe/tree/main/src/Servers/EffinitiveServer)
+
+## Dockerfile
+
+```dockerfile
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY Directory.Build.props .
+COPY src/Servers/EffinitiveServer/ src/Servers/EffinitiveServer/
+RUN dotnet restore src/Servers/EffinitiveServer/EffinitiveServer.csproj
+RUN dotnet publish src/Servers/EffinitiveServer/EffinitiveServer.csproj -c Release -o /app --no-restore
+
+FROM mcr.microsoft.com/dotnet/runtime:10.0
+WORKDIR /app
+COPY --from=build /app .
+USER $APP_UID
+ENTRYPOINT ["dotnet", "EffinitiveServer.dll", "8080"]
+```
+
+## Source — `Program.cs`
+
+```csharp
+using System.Text;
+using EffinitiveFramework.Core;
+using EffinitiveFramework.Core.Http;
+
+var port = args.Length > 0 && int.TryParse(args[0], out var p) ? p : 8080;
+
+var app = EffinitiveApp
+    .Create()
+    .UsePort(port)
+    .MapEndpoints()
+    .Build();
+
+Console.WriteLine($"Effinitive listening on http://localhost:{port}");
+await app.RunAsync();
+
+namespace EffinitiveServer.Endpoints
+{
+    // ── GET / ──────────────────────────────────────────────────────
+
+    sealed class GetRoot : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "GET";
+        protected override string Route => "/";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult("OK");
+    }
+
+    // ── POST / ─────────────────────────────────────────────────────
+
+    sealed class PostRoot : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "POST";
+        protected override string Route => "/";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+        {
+            var body = HttpContext?.Body;
+            return ValueTask.FromResult(body is { Length: > 0 } ? Encoding.UTF8.GetString(body) : "");
+        }
+    }
+
+    // ── GET/POST /echo ────────────────────────────────────────────
+
+    sealed class EchoGet : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "GET";
+        protected override string Route => "/echo";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.EchoHeaders(HttpContext));
+    }
+
+    sealed class EchoPost : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "POST";
+        protected override string Route => "/echo";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.EchoHeaders(HttpContext));
+    }
+
+    // ── GET/POST /cookie ──────────────────────────────────────────
+
+    sealed class CookieGet : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "GET";
+        protected override string Route => "/cookie";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.ParseCookies(HttpContext));
+    }
+
+    sealed class CookiePost : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "POST";
+        protected override string Route => "/cookie";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.ParseCookies(HttpContext));
+    }
+
+    // ── Shared helpers ────────────────────────────────────────────
+
+    static class Helpers
+    {
+        public const string TextPlain = "text/plain";
+
+        public static string EchoHeaders(HttpRequest? ctx)
+        {
+            if (ctx?.Headers is null) return "";
+            var sb = new StringBuilder();
+            foreach (var h in ctx.Headers)
+                sb.Append(h.Key).Append(": ").Append(h.Value).Append("\r\n");
+            return sb.ToString();
+        }
+
+        public static string ParseCookies(HttpRequest? ctx)
+        {
+            if (ctx is null) return "";
+            var sb = new StringBuilder();
+            foreach (var c in ctx.Cookies)
+                sb.Append(c.Key).Append('=').Append(c.Value).Append("\r\n");
+            return sb.ToString();
+        }
+    }
+}
+```
+
+## Test Results
+
+<div id="server-summary"><p><em>Loading results...</em></p></div>
+
+### Compliance
+
+<div id="results-compliance"></div>
+
+### Smuggling
+
+<div id="results-smuggling"></div>
+
+### Malformed Input
+
+<div id="results-malformedinput"></div>
+
+### Caching
+
+<div id="results-capabilities"></div>
+
+### Cookies
+
+<div id="results-cookies"></div>
+
+<script src="/probe/data.js"></script>
+<script src="/probe/render.js"></script>
+<script>
+(function() {
+  if (!window.PROBE_DATA) {
+    document.getElementById('server-summary').innerHTML = '<p><em>No probe data available yet. Run the Probe workflow on <code>main</code> to generate results.</em></p>';
+    return;
+  }
+  ProbeRender.renderServerPage('Effinitive');
+})();
+</script>
diff --git a/src/Servers/EffinitiveServer/Dockerfile b/src/Servers/EffinitiveServer/Dockerfile
new file mode 100644
index 0000000..ad3c2bc
--- /dev/null
+++ b/src/Servers/EffinitiveServer/Dockerfile
@@ -0,0 +1,12 @@
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY Directory.Build.props .
+COPY src/Servers/EffinitiveServer/ src/Servers/EffinitiveServer/
+RUN dotnet restore src/Servers/EffinitiveServer/EffinitiveServer.csproj
+RUN dotnet publish src/Servers/EffinitiveServer/EffinitiveServer.csproj -c Release -o /app --no-restore
+
+FROM mcr.microsoft.com/dotnet/runtime:10.0
+WORKDIR /app
+COPY --from=build /app .
+USER $APP_UID
+ENTRYPOINT ["dotnet", "EffinitiveServer.dll", "8080"]
diff --git a/src/Servers/EffinitiveServer/EffinitiveServer.csproj b/src/Servers/EffinitiveServer/EffinitiveServer.csproj
new file mode 100644
index 0000000..dc4fd83
--- /dev/null
+++ b/src/Servers/EffinitiveServer/EffinitiveServer.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="EffinitiveFramework.Core" Version="1.3.1" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/Servers/EffinitiveServer/Program.cs b/src/Servers/EffinitiveServer/Program.cs
new file mode 100644
index 0000000..d1eba00
--- /dev/null
+++ b/src/Servers/EffinitiveServer/Program.cs
@@ -0,0 +1,113 @@
+using System.Text;
+using EffinitiveFramework.Core;
+using EffinitiveFramework.Core.Http;
+
+var port = args.Length > 0 && int.TryParse(args[0], out var p) ? p : 8080;
+
+var app = EffinitiveApp
+    .Create()
+    .UsePort(port)
+    .MapEndpoints()
+    .Build();
+
+Console.WriteLine($"Effinitive listening on http://localhost:{port}");
+await app.RunAsync();
+
+namespace EffinitiveServer.Endpoints
+{
+    // ── GET / ──────────────────────────────────────────────────────
+
+    sealed class GetRoot : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "GET";
+        protected override string Route => "/";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult("OK");
+    }
+
+    // ── POST / ─────────────────────────────────────────────────────
+
+    sealed class PostRoot : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "POST";
+        protected override string Route => "/";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+        {
+            var body = HttpContext?.Body;
+            return ValueTask.FromResult(body is { Length: > 0 } ? Encoding.UTF8.GetString(body) : "");
+        }
+    }
+
+    // ── GET/POST /echo ────────────────────────────────────────────
+
+    sealed class EchoGet : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "GET";
+        protected override string Route => "/echo";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.EchoHeaders(HttpContext));
+    }
+
+    sealed class EchoPost : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "POST";
+        protected override string Route => "/echo";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.EchoHeaders(HttpContext));
+    }
+
+    // ── GET/POST /cookie ──────────────────────────────────────────
+
+    sealed class CookieGet : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "GET";
+        protected override string Route => "/cookie";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.ParseCookies(HttpContext));
+    }
+
+    sealed class CookiePost : NoRequestEndpointBase<string>
+    {
+        protected override string Method => "POST";
+        protected override string Route => "/cookie";
+        protected override string ContentType => Helpers.TextPlain;
+
+        public override ValueTask<string> HandleAsync(CancellationToken ct = default)
+            => ValueTask.FromResult(Helpers.ParseCookies(HttpContext));
+    }
+
+    // ── Shared helpers ────────────────────────────────────────────
+
+    static class Helpers
+    {
+        public const string TextPlain = "text/plain";
+
+        public static string EchoHeaders(HttpRequest? ctx)
+        {
+            if (ctx?.Headers is null) return "";
+            var sb = new StringBuilder();
+            foreach (var h in ctx.Headers)
+                sb.Append(h.Key).Append(": ").Append(h.Value).Append("\r\n");
+            return sb.ToString();
+        }
+
+        public static string ParseCookies(HttpRequest? ctx)
+        {
+            if (ctx is null) return "";
+            var sb = new StringBuilder();
+            foreach (var c in ctx.Cookies)
+                sb.Append(c.Key).Append('=').Append(c.Value).Append("\r\n");
+            return sb.ToString();
+        }
+    }
+}
diff --git a/src/Servers/EffinitiveServer/probe.json b/src/Servers/EffinitiveServer/probe.json
new file mode 100644
index 0000000..66a0a17
--- /dev/null
+++ b/src/Servers/EffinitiveServer/probe.json
@@ -0,0 +1 @@
+{"name": "Effinitive", "language": "C#"}
\ No newline at end of file