diff --git a/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj b/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj
index 9d36a6bffdb8..d76abad9b241 100644
--- a/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj
+++ b/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj
@@ -37,6 +37,7 @@ Microsoft.AspNetCore.Http.HttpResponse</Description>
   <ItemGroup>
     <InternalsVisibleTo Include="Microsoft.AspNetCore.Http.Abstractions.Microbenchmarks" />
     <InternalsVisibleTo Include="Microsoft.AspNetCore.Http.Extensions" />
+    <InternalsVisibleTo Include="Microsoft.AspNetCore.Http.Results" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Http/Http.Results/src/AcceptedAtRouteOfT.cs b/src/Http/Http.Results/src/AcceptedAtRouteOfT.cs
index eee96dbb54a5..e01be31eca3b 100644
--- a/src/Http/Http.Results/src/AcceptedAtRouteOfT.cs
+++ b/src/Http/Http.Results/src/AcceptedAtRouteOfT.cs
@@ -122,6 +122,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status202Accepted, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status202Accepted, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/AcceptedOfT.cs b/src/Http/Http.Results/src/AcceptedOfT.cs
index 0fcd1676f8fe..939f45f19e92 100644
--- a/src/Http/Http.Results/src/AcceptedOfT.cs
+++ b/src/Http/Http.Results/src/AcceptedOfT.cs
@@ -100,6 +100,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status202Accepted, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status202Accepted, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/BadRequestOfT.cs b/src/Http/Http.Results/src/BadRequestOfT.cs
index 76d2da6f09aa..d28929f595af 100644
--- a/src/Http/Http.Results/src/BadRequestOfT.cs
+++ b/src/Http/Http.Results/src/BadRequestOfT.cs
@@ -65,6 +65,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status400BadRequest, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status400BadRequest, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/ConflictOfT.cs b/src/Http/Http.Results/src/ConflictOfT.cs
index 1bfa6f07c954..325ba7a90b89 100644
--- a/src/Http/Http.Results/src/ConflictOfT.cs
+++ b/src/Http/Http.Results/src/ConflictOfT.cs
@@ -65,6 +65,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status409Conflict, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status409Conflict, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/CreatedAtRouteOfT.cs b/src/Http/Http.Results/src/CreatedAtRouteOfT.cs
index 3c7ec16337f6..28fd3dc69162 100644
--- a/src/Http/Http.Results/src/CreatedAtRouteOfT.cs
+++ b/src/Http/Http.Results/src/CreatedAtRouteOfT.cs
@@ -125,6 +125,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status201Created, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status201Created, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/CreatedOfT.cs b/src/Http/Http.Results/src/CreatedOfT.cs
index d89ba7fb4ea1..beda8bd77995 100644
--- a/src/Http/Http.Results/src/CreatedOfT.cs
+++ b/src/Http/Http.Results/src/CreatedOfT.cs
@@ -99,6 +99,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status201Created, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status201Created, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/FileContentHttpResult.cs b/src/Http/Http.Results/src/FileContentHttpResult.cs
index b8496be0752d..f60e4d7d0b3f 100644
--- a/src/Http/Http.Results/src/FileContentHttpResult.cs
+++ b/src/Http/Http.Results/src/FileContentHttpResult.cs
@@ -61,7 +61,7 @@ internal FileContentHttpResult(
     {
         FileContents = fileContents;
         FileLength = fileContents.Length;
-        ContentType = contentType ?? "application/octet-stream";
+        ContentType = contentType ?? HttpResultsHelper.BinaryContentType;
         FileDownloadName = fileDownloadName;
         EnableRangeProcessing = enableRangeProcessing;
         LastModified = lastModified;
diff --git a/src/Http/Http.Results/src/FileStreamHttpResult.cs b/src/Http/Http.Results/src/FileStreamHttpResult.cs
index 12266995a453..e5ca5d76c918 100644
--- a/src/Http/Http.Results/src/FileStreamHttpResult.cs
+++ b/src/Http/Http.Results/src/FileStreamHttpResult.cs
@@ -67,7 +67,7 @@ internal FileStreamHttpResult(
             FileLength = fileStream.Length;
         }
 
-        ContentType = contentType ?? "application/octet-stream";
+        ContentType = contentType ?? HttpResultsHelper.BinaryContentType;
         FileDownloadName = fileDownloadName;
         EnableRangeProcessing = enableRangeProcessing;
         LastModified = lastModified;
diff --git a/src/Http/Http.Results/src/HttpResultsHelper.cs b/src/Http/Http.Results/src/HttpResultsHelper.cs
index 1bf697ea55a5..a7a9de11661e 100644
--- a/src/Http/Http.Results/src/HttpResultsHelper.cs
+++ b/src/Http/Http.Results/src/HttpResultsHelper.cs
@@ -17,7 +17,13 @@ namespace Microsoft.AspNetCore.Http;
 
 internal static partial class HttpResultsHelper
 {
+    internal const string BinaryContentType = "application/octet-stream";
     internal const string DefaultContentType = "text/plain; charset=utf-8";
+    internal const string ProblemDetailsContentType = "application/problem+json";
+
+    internal static IEnumerable<string> ApplicationJsonContentTypes { get; } = ["application/json"];
+    internal static IEnumerable<string> ProblemDetailsContentTypes { get; } = [ProblemDetailsContentType];
+
     private static readonly Encoding DefaultEncoding = Encoding.UTF8;
 
     [UnconditionalSuppressMessage("Trimming", "IL2026:RequiresUnreferencedCode",
diff --git a/src/Http/Http.Results/src/InternalServerErrorOfT.cs b/src/Http/Http.Results/src/InternalServerErrorOfT.cs
index 5776accbf75e..85493f1957df 100644
--- a/src/Http/Http.Results/src/InternalServerErrorOfT.cs
+++ b/src/Http/Http.Results/src/InternalServerErrorOfT.cs
@@ -65,6 +65,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status500InternalServerError, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status500InternalServerError, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/NotFoundOfT.cs b/src/Http/Http.Results/src/NotFoundOfT.cs
index 87bc178baa91..c803b2067530 100644
--- a/src/Http/Http.Results/src/NotFoundOfT.cs
+++ b/src/Http/Http.Results/src/NotFoundOfT.cs
@@ -64,6 +64,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status404NotFound, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status404NotFound, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/OkOfT.cs b/src/Http/Http.Results/src/OkOfT.cs
index e85dc889ab4d..ba5efa0c2319 100644
--- a/src/Http/Http.Results/src/OkOfT.cs
+++ b/src/Http/Http.Results/src/OkOfT.cs
@@ -64,6 +64,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status200OK, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status200OK, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/PhysicalFileHttpResult.cs b/src/Http/Http.Results/src/PhysicalFileHttpResult.cs
index 7b44bd6c1bc3..aa8cadf5e71f 100644
--- a/src/Http/Http.Results/src/PhysicalFileHttpResult.cs
+++ b/src/Http/Http.Results/src/PhysicalFileHttpResult.cs
@@ -58,7 +58,7 @@ internal PhysicalFileHttpResult(
         EntityTagHeaderValue? entityTag = null)
     {
         FileName = fileName;
-        ContentType = contentType ?? "application/octet-stream";
+        ContentType = contentType ?? HttpResultsHelper.BinaryContentType;
         FileDownloadName = fileDownloadName;
         EnableRangeProcessing = enableRangeProcessing;
         LastModified = lastModified;
diff --git a/src/Http/Http.Results/src/ProblemHttpResult.cs b/src/Http/Http.Results/src/ProblemHttpResult.cs
index 4cea9e33ff43..9eec49a20642 100644
--- a/src/Http/Http.Results/src/ProblemHttpResult.cs
+++ b/src/Http/Http.Results/src/ProblemHttpResult.cs
@@ -36,7 +36,7 @@ internal ProblemHttpResult(ProblemDetails problemDetails)
     /// <summary>
     /// Gets the value for the <c>Content-Type</c> header: <c>application/problem+json</c>
     /// </summary>
-    public string ContentType => "application/problem+json";
+    public string ContentType => HttpResultsHelper.ProblemDetailsContentType;
 
     /// <summary>
     /// Gets the HTTP status code.
diff --git a/src/Http/Http.Results/src/UnprocessableEntityOfT.cs b/src/Http/Http.Results/src/UnprocessableEntityOfT.cs
index 3193ab69d674..764ed15514ac 100644
--- a/src/Http/Http.Results/src/UnprocessableEntityOfT.cs
+++ b/src/Http/Http.Results/src/UnprocessableEntityOfT.cs
@@ -65,6 +65,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status422UnprocessableEntity, typeof(TValue), new[] { "application/json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(TValue), StatusCodes.Status422UnprocessableEntity, HttpResultsHelper.ApplicationJsonContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/ValidationProblem.cs b/src/Http/Http.Results/src/ValidationProblem.cs
index eaecf6bb72ac..653ac7bfe1c3 100644
--- a/src/Http/Http.Results/src/ValidationProblem.cs
+++ b/src/Http/Http.Results/src/ValidationProblem.cs
@@ -39,7 +39,7 @@ internal ValidationProblem(HttpValidationProblemDetails problemDetails)
     /// <summary>
     /// Gets the value for the <c>Content-Type</c> header: <c>application/problem+json</c>.
     /// </summary>
-    public string ContentType => "application/problem+json";
+    public string ContentType => HttpResultsHelper.ProblemDetailsContentType;
 
     /// <summary>
     /// Gets the HTTP status code: <see cref="StatusCodes.Status400BadRequest"/>
@@ -76,6 +76,6 @@ static void IEndpointMetadataProvider.PopulateMetadata(MethodInfo method, Endpoi
         ArgumentNullException.ThrowIfNull(method);
         ArgumentNullException.ThrowIfNull(builder);
 
-        builder.Metadata.Add(new ProducesResponseTypeMetadata(StatusCodes.Status400BadRequest, typeof(HttpValidationProblemDetails), new[] { "application/problem+json" }));
+        builder.Metadata.Add(ProducesResponseTypeMetadata.CreateUnvalidated(typeof(HttpValidationProblemDetails), StatusCodes.Status400BadRequest, HttpResultsHelper.ProblemDetailsContentTypes));
     }
 }
diff --git a/src/Http/Http.Results/src/VirtualFileHttpResult.cs b/src/Http/Http.Results/src/VirtualFileHttpResult.cs
index e3107f4b7929..10e677e1247f 100644
--- a/src/Http/Http.Results/src/VirtualFileHttpResult.cs
+++ b/src/Http/Http.Results/src/VirtualFileHttpResult.cs
@@ -63,7 +63,7 @@ internal VirtualFileHttpResult(
         EntityTagHeaderValue? entityTag = null)
     {
         FileName = fileName;
-        ContentType = contentType ?? "application/octet-stream";
+        ContentType = contentType ?? HttpResultsHelper.BinaryContentType;
         FileDownloadName = fileDownloadName;
         EnableRangeProcessing = enableRangeProcessing;
         LastModified = lastModified;