Fix handling for reference IDs with http prefix

build.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+echo "Building Microsoft.OpenApi"
+
+PROJ="$(dirname "$0")/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj"
+dotnet msbuild "$PROJ" /t:restore /p:Configuration=Release
+dotnet msbuild "$PROJ" /t:build /p:Configuration=Release
+dotnet msbuild "$PROJ" /t:pack "/p:Configuration=Release;PackageOutputPath=$(dirname "$0")/artifacts"
+
+echo "Building Microsoft.OpenApi.Readers"
+
+PROJ="$(dirname "$0")/src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj"
+dotnet msbuild "$PROJ" /t:restore /p:Configuration=Release
+dotnet msbuild "$PROJ" /t:build /p:Configuration=Release
+dotnet msbuild "$PROJ" /t:pack "/p:Configuration=Release;PackageOutputPath=$(dirname "$0")/artifacts"
+
+echo "Building Microsoft.OpenApi.Hidi"
+
+PROJ="$(dirname "$0")/src/Microsoft.OpenApi.Hidi/Microsoft.OpenApi.Hidi.csproj"
+dotnet msbuild "$PROJ" /t:restore /p:Configuration=Release
+dotnet msbuild "$PROJ" /t:build /p:Configuration=Release
+dotnet msbuild "$PROJ" /t:pack "/p:Configuration=Release;PackageOutputPath=$(dirname "$0")/artifacts"

global.json

@@ -0,0 +1,5 @@
+{
+  "sdk": {
+    "version": "8.0.406"
+  }
+}

src/Microsoft.OpenApi/Models/OpenApiReference.cs

@@ -97,7 +97,8 @@ public string ReferenceV3
                 {
                     return Id;
                 }
-                if (Id.StartsWith("http", StringComparison.OrdinalIgnoreCase))
+                if (Id.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ||
+                    Id.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
                 {
                     return Id;
                 }
@@ -241,7 +242,8 @@ private string GetExternalReferenceV3()
                     return ExternalResource + "#" + Id;
                 }
 
-                if (Id.StartsWith("http", StringComparison.OrdinalIgnoreCase))
+                if (Id.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ||
+                    Id.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
                 {
                     return Id;
                 }

test/Microsoft.OpenApi.Tests/Models/OpenApiReferenceTests.cs

@@ -15,6 +15,7 @@ public class OpenApiReferenceTests
         [InlineData("#/components/schemas/Pet", ReferenceType.Schema, "Pet")]
         [InlineData("#/components/parameters/name", ReferenceType.Parameter, "name")]
         [InlineData("#/components/responses/200", ReferenceType.Response, "200")]
+        [InlineData("#/components/schemas/HttpValidationsProblem", ReferenceType.Schema, "HttpValidationsProblem")]
         public void SettingInternalReferenceForComponentsStyleReferenceShouldSucceed(
             string input,
             ReferenceType type,
@@ -43,6 +44,7 @@ public void SettingInternalReferenceForComponentsStyleReferenceShouldSucceed(
         [InlineData("Pet.json#/components/schemas/Pet", "Pet.json", "Pet", ReferenceType.Schema)]
         [InlineData("Pet.yaml#/components/schemas/Pet", "Pet.yaml", "Pet", ReferenceType.Schema)]
         [InlineData("abc#/components/schemas/Pet", "abc", "Pet", ReferenceType.Schema)]
+        [InlineData("abc#/components/schemas/HttpsValidationProblem", "abc", "HttpsValidationProblem", ReferenceType.Schema)]
         public void SettingExternalReferenceV3ShouldSucceed(string expected, string externalResource, string id, ReferenceType? type)
         {
             // Arrange & Act
@@ -105,6 +107,30 @@ public async Task SerializeSchemaReferenceAsJsonV3Works()
             Assert.Equal(expected, actual);
         }
 
+        [Theory]
+        [InlineData("HttpValidationProblemDetails", "#/components/schemas/HttpValidationProblemDetails")]
+        [InlineData("http://example.com", "http://example.com")]
+        [InlineData("https://example.com", "https://example.com")]
+        public async Task SerializeHttpSchemaReferenceAsJsonV31Works(string id, string referenceV3)
+        {
+            // Arrange
+            var reference = new OpenApiReference { Type = ReferenceType.Schema, Id = id };
+            var expected =
+                $$"""
+                {
+                  "$ref": "{{referenceV3}}"
+                }
+                """;
+
+            // Act
+            var actual = await reference.SerializeAsJsonAsync(OpenApiSpecVersion.OpenApi3_1);
+            expected = expected.MakeLineBreaksEnvironmentNeutral();
+            actual = actual.MakeLineBreaksEnvironmentNeutral();
+
+            // Assert
+            Assert.Equal(expected, actual);
+        }
+
         [Fact]
         public async Task SerializeSchemaReferenceAsYamlV3Works()
         {