diff --git a/src/Private/CanonicalRequest.cs b/src/Private/CanonicalRequest.cs
index 964d5d34..6a1f1369 100644
--- a/src/Private/CanonicalRequest.cs
+++ b/src/Private/CanonicalRequest.cs
@@ -45,6 +45,11 @@ public static class CanonicalRequest
             "trailer",
             "transfer-encoding",
             "upgrade",
+            "user-agent",
+            "via",
+            "x-forwarded-for",
+            "x-forwarded-port",
+            "x-forwarded-proto",
             HeaderKeys.XAmznTraceIdHeader
         ];
 
diff --git a/test/Unit/Private/CanonicalRequestShould.cs b/test/Unit/Private/CanonicalRequestShould.cs
index 9933ff8b..942697af 100644
--- a/test/Unit/Private/CanonicalRequestShould.cs
+++ b/test/Unit/Private/CanonicalRequestShould.cs
@@ -34,9 +34,14 @@ public CanonicalRequestShould(TestSuiteContext context)
                 new[] { "TE", "gzip"},
                 new[] { "Trailer", "Expires"},
                 new[] { "Transfer-Encoding", "gzip"},
-                new[] { "Upgrade", "websocket"}
+                new[] { "Upgrade", "websocket"},
+                new[] { "User-Agent", "curl/7.64.1"},
+                new[] { "Via", "HTTP/1.1 my_proxy"},
+                new[] { "X-Forwarded-For", "203.0.113.195"},
+                new[] { "X-Forwarded-Port", "443"},
+                new[] { "X-Forwarded-Proto", "http"},
             };
-        
+
 
         [Theory]
         [InlineData("get-header-key-duplicate")]
@@ -261,7 +266,7 @@ internal static void AddUnsignableHeaders(HttpRequestMessage request)
             foreach (var testCase in UnsignableHeadersTestCases)
             {
                 var headerName = (string)testCase[0];
-                var headerValue = (string)testCase[0];
+                var headerValue = (string)testCase[1];
 
                 // Exclude the following headers due to them failing
                 if (headerValue is "Range" or "Transfer-Encoding")