From 85046d8cace696f2285f4fe34710ad7b5fd1514f Mon Sep 17 00:00:00 2001
From: Solo Yolo <solo@yolo.com>
Date: Thu, 26 Mar 2026 23:33:17 +0900
Subject: [PATCH 1/2] bench: add net9.0 target to Refit.Benchmarks

Add net9.0 alongside net8.0 as a benchmark target framework
to enable performance measurement on the latest .NET runtime.
---
 Refit.Benchmarks/Refit.Benchmarks.csproj | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Refit.Benchmarks/Refit.Benchmarks.csproj b/Refit.Benchmarks/Refit.Benchmarks.csproj
index a02d65e65..884a15d19 100644
--- a/Refit.Benchmarks/Refit.Benchmarks.csproj
+++ b/Refit.Benchmarks/Refit.Benchmarks.csproj
@@ -4,7 +4,7 @@
   
     <PropertyGroup>
       <OutputType>Exe</OutputType>
-      <TargetFrameworks>net8.0</TargetFrameworks>
+      <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
       <IsPackable>false</IsPackable>
       <NoWarn>$(NoWarn);CS1591</NoWarn>
     </PropertyGroup>

From 8d089b1c5d4a37acaf9274803f5d882008675892 Mon Sep 17 00:00:00 2001
From: Solo Yolo <solo@yolo.com>
Date: Thu, 26 Mar 2026 23:40:45 +0900
Subject: [PATCH 2/2] perf: replace Activator.CreateInstance with direct
 constructor in ApiResponse.Create
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Replace the reflection-based `Activator.CreateInstance(typeof(ApiResponse<TBody>), ...)`
with a direct `new ApiResponse<TBody>(...)` constructor call, and change the `content`
parameter type from `object?` to `TBody?` to eliminate boxing for value types.

This removes per-call reflection overhead on every ApiResponse<T> creation, which
is the second most common return type pattern in Refit usage (found in 76+ public repos).

Benchmark results (BenchmarkDotNet v0.14.0, .NET 9.0.14, AMD Ryzen 7 7700):

| Scenario              | Before (μs) | After (μs) | Δ Latency | Before (KB) | After (KB) | Δ Alloc |
|-----------------------|-------------|------------|-----------|-------------|------------|---------|
| OK/Get/STJ            | 6.137       | 5.949      | -3.1%     | 9.84        | 9.52       | -3.3%   |
| OK/Get/Newtonsoft     | 9.105       | 8.986      | -1.3%     | 19.52       | 19.20      | -1.6%   |
| OK/Post/STJ           | 6.732       | 6.669      | -0.9%     | 10.89       | 10.56      | -3.0%   |
| OK/Post/Newtonsoft    | 14.204      | 13.814     | -2.7%     | 32.03       | 31.72      | -1.0%   |
| Error/Get/STJ         | 2.634       | 2.350      | -10.8%    | 12.66       | 12.33      | -2.6%   |
| Error/Get/Newtonsoft  | 2.549       | 2.358      | -7.5%     | 12.66       | 12.33      | -2.6%   |
| Error/Post/STJ        | 3.273       | 3.111      | -4.9%     | 13.70       | 13.38      | -2.3%   |
| Error/Post/Newtonsoft | 7.561       | 7.362      | -2.6%     | 25.16       | 24.84      | -1.3%   |

Average: -3.1% latency, -1.9% allocations across all scenarios.
Error path sees the largest gains (-10.8%) since the reflection overhead
is a larger fraction of total execution time.
---
 Refit/ApiResponse.cs                  | 12 ++----------
 Refit/RequestBuilderImplementation.cs |  2 +-
 2 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/Refit/ApiResponse.cs b/Refit/ApiResponse.cs
index 86b485df1..deb0b41bd 100644
--- a/Refit/ApiResponse.cs
+++ b/Refit/ApiResponse.cs
@@ -10,20 +10,12 @@ static class ApiResponse
         internal static T Create<T, TBody>(
             HttpRequestMessage request,
             HttpResponseMessage? resp,
-            object? content,
+            TBody? content,
             RefitSettings settings,
             ApiExceptionBase? error = null
         )
         {
-            return (T)
-                Activator.CreateInstance(
-                    typeof(ApiResponse<TBody>),
-                    request,
-                    resp,
-                    content,
-                    settings,
-                    error
-                )!;
+            return (T)(object)new ApiResponse<TBody>(request, resp, content, settings, error);
         }
     }
 
diff --git a/Refit/RequestBuilderImplementation.cs b/Refit/RequestBuilderImplementation.cs
index 2877f07cb..042ddfae6 100644
--- a/Refit/RequestBuilderImplementation.cs
+++ b/Refit/RequestBuilderImplementation.cs
@@ -407,7 +407,7 @@ object itemValue
                         return ApiResponse.Create<T, TBody>(
                             rq,
                             resp,
-                            null,
+                            default,
                             settings,
                             new ApiRequestException(rq, rq.Method, settings, ex)
                         );