From 5a4c238c3f9b8fac1e833fd314e02acf0dba1755 Mon Sep 17 00:00:00 2001
From: Benziza <benizizamohamed@gmail.com>
Date: Sun, 27 Sep 2026 20:35:03 +0200
Subject: [PATCH 1/2] Expose HTTP response trailing headers

---
 src/RestSharp/Response/RestResponse.cs       |  5 ++-
 src/RestSharp/Response/RestResponseBase.cs   |  5 +++
 test/RestSharp.Tests/ResponseTrailerTests.cs | 36 ++++++++++++++++++++
 3 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 test/RestSharp.Tests/ResponseTrailerTests.cs

diff --git a/src/RestSharp/Response/RestResponse.cs b/src/RestSharp/Response/RestResponse.cs
index d092271e6..a567f52fb 100644
--- a/src/RestSharp/Response/RestResponse.cs
+++ b/src/RestSharp/Response/RestResponse.cs
@@ -73,6 +73,9 @@ async Task<RestResponse> GetDefaultResponse() {
                 Server              = httpResponse.Headers.Server.ToString(),
                 StatusCode          = httpResponse.StatusCode,
                 StatusDescription   = httpResponse.ReasonPhrase,
+#if NET
+                TrailingHeaders     = httpResponse.TrailingHeaders.GetHeaderParameters(),
+#endif
                 Version             = httpResponse.RequestMessage?.Version
             };
         }
@@ -94,4 +97,4 @@ public RestResponse() : this(new()) { }
     }
 }
 
-public delegate ResponseStatus CalculateResponseStatus(HttpResponseMessage httpResponse);
\ No newline at end of file
+public delegate ResponseStatus CalculateResponseStatus(HttpResponseMessage httpResponse);
diff --git a/src/RestSharp/Response/RestResponseBase.cs b/src/RestSharp/Response/RestResponseBase.cs
index 57b1f5c4a..8236c9163 100644
--- a/src/RestSharp/Response/RestResponseBase.cs
+++ b/src/RestSharp/Response/RestResponseBase.cs
@@ -111,6 +111,11 @@ protected RestResponseBase(RestRequest request) {
     /// </summary>
     public IReadOnlyCollection<HeaderParameter>? ContentHeaders { get; set; }
 
+    /// <summary>
+    /// Trailer headers returned by server after the response content
+    /// </summary>
+    public IReadOnlyCollection<HeaderParameter> TrailingHeaders { get; set; } = Array.Empty<HeaderParameter>();
+
     /// <summary>
     /// Status of the request. Will return Error for transport errors.
     /// HTTP errors will still return ResponseStatus.Completed, check StatusCode instead
diff --git a/test/RestSharp.Tests/ResponseTrailerTests.cs b/test/RestSharp.Tests/ResponseTrailerTests.cs
new file mode 100644
index 000000000..5b3944001
--- /dev/null
+++ b/test/RestSharp.Tests/ResponseTrailerTests.cs
@@ -0,0 +1,36 @@
+using System.Net;
+
+namespace RestSharp.Tests;
+
+public class ResponseTrailerTests {
+#if NET
+    [Fact]
+    public async Task Should_map_trailing_headers_separately_from_regular_headers() {
+        using var client = new RestClient(
+            new RestClientOptions("https://dummy.org") { ConfigureMessageHandler = _ => new TrailerResponseHandler() }
+        );
+
+        var response = await client.ExecuteAsync(new RestRequest());
+
+        response.TrailingHeaders.Should().BeEquivalentTo(
+            new[] {
+                new HeaderParameter("Digest", "sha-256=abc"),
+                new HeaderParameter("Digest", "sha-256=def"),
+                new HeaderParameter("X-Processing-Status", "complete")
+            }
+        );
+        response.Headers.Should().ContainSingle(x => x.Name == "X-Regular-Header" && x.Value == "regular");
+        response.Headers.Should().NotContain(x => x.Name == "Digest" || x.Name == "X-Processing-Status");
+    }
+
+    class TrailerResponseHandler : HttpMessageHandler {
+        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) {
+            var response = new HttpResponseMessage(HttpStatusCode.OK) { Content = new StringContent("{}") };
+            response.Headers.TryAddWithoutValidation("X-Regular-Header", "regular");
+            response.TrailingHeaders.TryAddWithoutValidation("Digest", ["sha-256=abc", "sha-256=def"]);
+            response.TrailingHeaders.TryAddWithoutValidation("X-Processing-Status", "complete");
+            return Task.FromResult(response);
+        }
+    }
+#endif
+}

From 07a52edf8e3b290a0c6b769ed82e091f3e0a9cb2 Mon Sep 17 00:00:00 2001
From: Benziza <benizizamohamed@gmail.com>
Date: Sun, 27 Sep 2026 20:43:44 +0200
Subject: [PATCH 2/2] Test trailer separation from content headers

---
 test/RestSharp.Tests/ResponseTrailerTests.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/RestSharp.Tests/ResponseTrailerTests.cs b/test/RestSharp.Tests/ResponseTrailerTests.cs
index 5b3944001..457e65fb7 100644
--- a/test/RestSharp.Tests/ResponseTrailerTests.cs
+++ b/test/RestSharp.Tests/ResponseTrailerTests.cs
@@ -21,6 +21,7 @@ public async Task Should_map_trailing_headers_separately_from_regular_headers()
         );
         response.Headers.Should().ContainSingle(x => x.Name == "X-Regular-Header" && x.Value == "regular");
         response.Headers.Should().NotContain(x => x.Name == "Digest" || x.Name == "X-Processing-Status");
+        response.ContentHeaders.Should().NotContain(x => x.Name == "Digest" || x.Name == "X-Processing-Status");
     }
 
     class TrailerResponseHandler : HttpMessageHandler {