diff --git a/appveyor.yml b/appveyor.yml
index 452ce09918d..24610d9100e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -35,6 +35,12 @@ install:
   - ps: Install-Module Pester -Force -Scope CurrentUser
 build_script:
   - dotnet --info
+  # build C# aspnetcore 3.1 server
+  - dotnet build samples\server\petstore\aspnetcore-3.1\Org.OpenAPITools.sln
+  # build C# aspnetcore 3.0 server
+  - dotnet build samples\server\petstore\aspnetcore-3.0\Org.OpenAPITools.sln
+  # build C# aspnetcore 2.2 server
+  - dotnet build samples\server\petstore\aspnetcore\Org.OpenAPITools.sln
   # build C# API client (netcore)
   - dotnet build samples\client\petstore\csharp-netcore\OpenAPIClient\Org.OpenAPITools.sln
   - dotnet build samples\client\petstore\csharp-netcore\OpenAPIClientCore\Org.OpenAPITools.sln
diff --git a/bin/configs/other/aspnetcore-3.0.yaml b/bin/configs/aspnetcore-3.0.yaml
similarity index 100%
rename from bin/configs/other/aspnetcore-3.0.yaml
rename to bin/configs/aspnetcore-3.0.yaml
diff --git a/bin/configs/other/aspnetcore-3.1.yaml b/bin/configs/aspnetcore-3.1.yaml
similarity index 100%
rename from bin/configs/other/aspnetcore-3.1.yaml
rename to bin/configs/aspnetcore-3.1.yaml
diff --git a/bin/configs/other/aspnetcore.yaml b/bin/configs/aspnetcore.yaml
similarity index 100%
rename from bin/configs/other/aspnetcore.yaml
rename to bin/configs/aspnetcore.yaml
diff --git a/samples/server/petstore/aspnetcore-3.0/.openapi-generator-ignore b/samples/server/petstore/aspnetcore-3.0/.openapi-generator-ignore
index 7484ee590a3..2832abc1812 100644
--- a/samples/server/petstore/aspnetcore-3.0/.openapi-generator-ignore
+++ b/samples/server/petstore/aspnetcore-3.0/.openapi-generator-ignore
@@ -21,3 +21,4 @@
 #docs/*.md
 # Then explicitly reverse the ignore rule for a single file:
 #!docs/README.md
+src/Org.OpenAPITools/Org.OpenAPITools.csproj
diff --git a/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES
index 4de0e641790..f39431847df 100644
--- a/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES
@@ -19,7 +19,6 @@ src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
-src/Org.OpenAPITools/Org.OpenAPITools.csproj
 src/Org.OpenAPITools/Program.cs
 src/Org.OpenAPITools/Properties/launchSettings.json
 src/Org.OpenAPITools/Startup.cs
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/ApiResponse.cs b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/ApiResponse.cs
index ef3413980ea..88e45fce388 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/ApiResponse.cs
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/ApiResponse.cs
@@ -65,7 +65,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Category.cs b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Category.cs
index 6ac6a181baf..e147a10073c 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Category.cs
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Category.cs
@@ -58,7 +58,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Order.cs b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Order.cs
index 77a4c75a1b1..e9013f0ed0d 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Order.cs
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Order.cs
@@ -116,7 +116,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Pet.cs b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Pet.cs
index a814c6e1edf..d5a816cd5ee 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Pet.cs
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Pet.cs
@@ -118,7 +118,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Tag.cs b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Tag.cs
index f0a131f617c..090f95cc494 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Tag.cs
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/Tag.cs
@@ -58,7 +58,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/User.cs b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/User.cs
index 3c8a18d63cf..4c6d96d08c5 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/User.cs
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Models/User.cs
@@ -101,7 +101,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Org.OpenAPITools.csproj b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Org.OpenAPITools.csproj
index df1ea5462ab..abb035c92cb 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Org.OpenAPITools.csproj
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/Org.OpenAPITools.csproj
@@ -7,7 +7,7 @@
     <PreserveCompilationContext>true</PreserveCompilationContext>
     <AssemblyName>Org.OpenAPITools</AssemblyName>
     <PackageId>Org.OpenAPITools</PackageId>
-    <UserSecretsId>330f2933-9cd6-4bdd-b976-92b33eea1166</UserSecretsId>
+    <UserSecretsId>4bc22b76-ee61-45c3-aae6-47cee9badaa0</UserSecretsId>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
     <DockerfileContext>..\..</DockerfileContext>
   </PropertyGroup>
diff --git a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/wwwroot/openapi-original.json b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/wwwroot/openapi-original.json
index c72a9d39daa..26519713741 100644
--- a/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/wwwroot/openapi-original.json
+++ b/samples/server/petstore/aspnetcore-3.0/src/Org.OpenAPITools/wwwroot/openapi-original.json
@@ -1008,5 +1008,6 @@
         "type" : "apiKey"
       }
     }
-  }
+  },
+  "x-original-swagger-version" : "2.0"
 }
diff --git a/samples/server/petstore/aspnetcore-3.1/.openapi-generator-ignore b/samples/server/petstore/aspnetcore-3.1/.openapi-generator-ignore
index 7484ee590a3..2832abc1812 100644
--- a/samples/server/petstore/aspnetcore-3.1/.openapi-generator-ignore
+++ b/samples/server/petstore/aspnetcore-3.1/.openapi-generator-ignore
@@ -21,3 +21,4 @@
 #docs/*.md
 # Then explicitly reverse the ignore rule for a single file:
 #!docs/README.md
+src/Org.OpenAPITools/Org.OpenAPITools.csproj
diff --git a/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES
index 4de0e641790..f39431847df 100644
--- a/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES
@@ -19,7 +19,6 @@ src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
-src/Org.OpenAPITools/Org.OpenAPITools.csproj
 src/Org.OpenAPITools/Program.cs
 src/Org.OpenAPITools/Properties/launchSettings.json
 src/Org.OpenAPITools/Startup.cs
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/ApiResponse.cs b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/ApiResponse.cs
index ef3413980ea..88e45fce388 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/ApiResponse.cs
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/ApiResponse.cs
@@ -65,7 +65,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Category.cs b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Category.cs
index 6ac6a181baf..e147a10073c 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Category.cs
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Category.cs
@@ -58,7 +58,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Order.cs b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Order.cs
index 77a4c75a1b1..e9013f0ed0d 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Order.cs
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Order.cs
@@ -116,7 +116,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Pet.cs b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Pet.cs
index a814c6e1edf..d5a816cd5ee 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Pet.cs
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Pet.cs
@@ -118,7 +118,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Tag.cs b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Tag.cs
index f0a131f617c..090f95cc494 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Tag.cs
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/Tag.cs
@@ -58,7 +58,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/User.cs b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/User.cs
index 3c8a18d63cf..4c6d96d08c5 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/User.cs
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Models/User.cs
@@ -101,7 +101,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Org.OpenAPITools.csproj b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Org.OpenAPITools.csproj
index 7b03995abb0..7668438e876 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Org.OpenAPITools.csproj
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/Org.OpenAPITools.csproj
@@ -7,7 +7,7 @@
     <PreserveCompilationContext>true</PreserveCompilationContext>
     <AssemblyName>Org.OpenAPITools</AssemblyName>
     <PackageId>Org.OpenAPITools</PackageId>
-    <UserSecretsId>0f711e23-5ed8-438c-ac28-a6dd0b863c05</UserSecretsId>
+    <UserSecretsId>4ddd97dd-77ed-459e-8cd0-dcb2f9e59a70</UserSecretsId>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
     <DockerfileContext>..\..</DockerfileContext>
   </PropertyGroup>
diff --git a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/wwwroot/openapi-original.json b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/wwwroot/openapi-original.json
index c72a9d39daa..26519713741 100644
--- a/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/wwwroot/openapi-original.json
+++ b/samples/server/petstore/aspnetcore-3.1/src/Org.OpenAPITools/wwwroot/openapi-original.json
@@ -1008,5 +1008,6 @@
         "type" : "apiKey"
       }
     }
-  }
+  },
+  "x-original-swagger-version" : "2.0"
 }
diff --git a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/ApiResponse.cs b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/ApiResponse.cs
index ef3413980ea..88e45fce388 100644
--- a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/ApiResponse.cs
+++ b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/ApiResponse.cs
@@ -65,7 +65,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Category.cs b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Category.cs
index 6ac6a181baf..e147a10073c 100644
--- a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Category.cs
+++ b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Category.cs
@@ -58,7 +58,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Order.cs b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Order.cs
index 77a4c75a1b1..e9013f0ed0d 100644
--- a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Order.cs
+++ b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Order.cs
@@ -116,7 +116,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Pet.cs b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Pet.cs
index a814c6e1edf..d5a816cd5ee 100644
--- a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Pet.cs
+++ b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Pet.cs
@@ -118,7 +118,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Tag.cs b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Tag.cs
index f0a131f617c..090f95cc494 100644
--- a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Tag.cs
+++ b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/Tag.cs
@@ -58,7 +58,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/User.cs b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/User.cs
index 3c8a18d63cf..4c6d96d08c5 100644
--- a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/User.cs
+++ b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/Models/User.cs
@@ -101,7 +101,7 @@ namespace Org.OpenAPITools.Models
         /// <returns>JSON string presentation of the object</returns>
         public string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            return Newtonsoft.Json.JsonConvert.SerializeObject(this, Newtonsoft.Json.Formatting.Indented);
         }
 
         /// <summary>
diff --git a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/wwwroot/openapi-original.json b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/wwwroot/openapi-original.json
index c72a9d39daa..26519713741 100644
--- a/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/wwwroot/openapi-original.json
+++ b/samples/server/petstore/aspnetcore/src/Org.OpenAPITools/wwwroot/openapi-original.json
@@ -1008,5 +1008,6 @@
         "type" : "apiKey"
       }
     }
-  }
+  },
+  "x-original-swagger-version" : "2.0"
 }