diff --git a/src/Microsoft.AspNetCore.Server.HttpSys/baseline.netcore.json b/src/Microsoft.AspNetCore.Server.HttpSys/baseline.netcore.json
new file mode 100644
index 0000000000..583baf7a3a
--- /dev/null
+++ b/src/Microsoft.AspNetCore.Server.HttpSys/baseline.netcore.json
@@ -0,0 +1,828 @@
+{
+  "AssemblyIdentity": "Microsoft.AspNetCore.Server.HttpSys, Version=2.0.3.0, Culture=neutral, PublicKeyToken=adb9793829ddae60",
+  "Types": [
+    {
+      "Name": "Microsoft.AspNetCore.Hosting.WebHostBuilderHttpSysExtensions",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "Abstract": true,
+      "Static": true,
+      "Sealed": true,
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Method",
+          "Name": "UseHttpSys",
+          "Parameters": [
+            {
+              "Name": "hostBuilder",
+              "Type": "Microsoft.AspNetCore.Hosting.IWebHostBuilder"
+            }
+          ],
+          "ReturnType": "Microsoft.AspNetCore.Hosting.IWebHostBuilder",
+          "Static": true,
+          "Extension": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "UseHttpSys",
+          "Parameters": [
+            {
+              "Name": "hostBuilder",
+              "Type": "Microsoft.AspNetCore.Hosting.IWebHostBuilder"
+            },
+            {
+              "Name": "options",
+              "Type": "System.Action<Microsoft.AspNetCore.Server.HttpSys.HttpSysOptions>"
+            }
+          ],
+          "ReturnType": "Microsoft.AspNetCore.Hosting.IWebHostBuilder",
+          "Static": true,
+          "Extension": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.AuthenticationManager",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "Sealed": true,
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Method",
+          "Name": "get_Schemes",
+          "Parameters": [],
+          "ReturnType": "Microsoft.AspNetCore.Server.HttpSys.AuthenticationSchemes",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_Schemes",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "Microsoft.AspNetCore.Server.HttpSys.AuthenticationSchemes"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_AllowAnonymous",
+          "Parameters": [],
+          "ReturnType": "System.Boolean",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_AllowAnonymous",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Boolean"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.AuthenticationSchemes",
+      "Visibility": "Public",
+      "Kind": "Enumeration",
+      "Sealed": true,
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Field",
+          "Name": "None",
+          "Parameters": [],
+          "GenericParameter": [],
+          "Literal": "0"
+        },
+        {
+          "Kind": "Field",
+          "Name": "Basic",
+          "Parameters": [],
+          "GenericParameter": [],
+          "Literal": "1"
+        },
+        {
+          "Kind": "Field",
+          "Name": "NTLM",
+          "Parameters": [],
+          "GenericParameter": [],
+          "Literal": "4"
+        },
+        {
+          "Kind": "Field",
+          "Name": "Negotiate",
+          "Parameters": [],
+          "GenericParameter": [],
+          "Literal": "8"
+        },
+        {
+          "Kind": "Field",
+          "Name": "Kerberos",
+          "Parameters": [],
+          "GenericParameter": [],
+          "Literal": "16"
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.HttpSysDefaults",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "Abstract": true,
+      "Static": true,
+      "Sealed": true,
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Field",
+          "Name": "AuthenticationScheme",
+          "Parameters": [],
+          "ReturnType": "System.String",
+          "Static": true,
+          "ReadOnly": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.HttpSysException",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "BaseType": "System.ComponentModel.Win32Exception",
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Method",
+          "Name": "get_ErrorCode",
+          "Parameters": [],
+          "ReturnType": "System.Int32",
+          "Virtual": true,
+          "Override": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.HttpSysOptions",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Method",
+          "Name": "get_MaxAccepts",
+          "Parameters": [],
+          "ReturnType": "System.Int32",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_MaxAccepts",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Int32"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_EnableResponseCaching",
+          "Parameters": [],
+          "ReturnType": "System.Boolean",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_EnableResponseCaching",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Boolean"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_UrlPrefixes",
+          "Parameters": [],
+          "ReturnType": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefixCollection",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_Authentication",
+          "Parameters": [],
+          "ReturnType": "Microsoft.AspNetCore.Server.HttpSys.AuthenticationManager",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_Timeouts",
+          "Parameters": [],
+          "ReturnType": "Microsoft.AspNetCore.Server.HttpSys.TimeoutManager",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_ThrowWriteExceptions",
+          "Parameters": [],
+          "ReturnType": "System.Boolean",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_ThrowWriteExceptions",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Boolean"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_MaxConnections",
+          "Parameters": [],
+          "ReturnType": "System.Nullable<System.Int64>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_MaxConnections",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Nullable<System.Int64>"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_RequestQueueLimit",
+          "Parameters": [],
+          "ReturnType": "System.Int64",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_RequestQueueLimit",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Int64"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_MaxRequestBodySize",
+          "Parameters": [],
+          "ReturnType": "System.Nullable<System.Int64>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_MaxRequestBodySize",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Nullable<System.Int64>"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_AllowSynchronousIO",
+          "Parameters": [],
+          "ReturnType": "System.Boolean",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_AllowSynchronousIO",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Boolean"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Constructor",
+          "Name": ".ctor",
+          "Parameters": [],
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.TimeoutManager",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "Sealed": true,
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Method",
+          "Name": "get_EntityBody",
+          "Parameters": [],
+          "ReturnType": "System.TimeSpan",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_EntityBody",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.TimeSpan"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_DrainEntityBody",
+          "Parameters": [],
+          "ReturnType": "System.TimeSpan",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_DrainEntityBody",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.TimeSpan"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_RequestQueue",
+          "Parameters": [],
+          "ReturnType": "System.TimeSpan",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_RequestQueue",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.TimeSpan"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_IdleConnection",
+          "Parameters": [],
+          "ReturnType": "System.TimeSpan",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_IdleConnection",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.TimeSpan"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_HeaderWait",
+          "Parameters": [],
+          "ReturnType": "System.TimeSpan",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_HeaderWait",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.TimeSpan"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_MinSendBytesPerSecond",
+          "Parameters": [],
+          "ReturnType": "System.Int64",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "set_MinSendBytesPerSecond",
+          "Parameters": [
+            {
+              "Name": "value",
+              "Type": "System.Int64"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "ImplementedInterfaces": [],
+      "Members": [
+        {
+          "Kind": "Method",
+          "Name": "Create",
+          "Parameters": [
+            {
+              "Name": "scheme",
+              "Type": "System.String"
+            },
+            {
+              "Name": "host",
+              "Type": "System.String"
+            },
+            {
+              "Name": "port",
+              "Type": "System.String"
+            },
+            {
+              "Name": "path",
+              "Type": "System.String"
+            }
+          ],
+          "ReturnType": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix",
+          "Static": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Create",
+          "Parameters": [
+            {
+              "Name": "scheme",
+              "Type": "System.String"
+            },
+            {
+              "Name": "host",
+              "Type": "System.String"
+            },
+            {
+              "Name": "portValue",
+              "Type": "System.Nullable<System.Int32>"
+            },
+            {
+              "Name": "path",
+              "Type": "System.String"
+            }
+          ],
+          "ReturnType": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix",
+          "Static": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Create",
+          "Parameters": [
+            {
+              "Name": "prefix",
+              "Type": "System.String"
+            }
+          ],
+          "ReturnType": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix",
+          "Static": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_IsHttps",
+          "Parameters": [],
+          "ReturnType": "System.Boolean",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_Scheme",
+          "Parameters": [],
+          "ReturnType": "System.String",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_Host",
+          "Parameters": [],
+          "ReturnType": "System.String",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_Port",
+          "Parameters": [],
+          "ReturnType": "System.String",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_PortValue",
+          "Parameters": [],
+          "ReturnType": "System.Int32",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_Path",
+          "Parameters": [],
+          "ReturnType": "System.String",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_FullPrefix",
+          "Parameters": [],
+          "ReturnType": "System.String",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Equals",
+          "Parameters": [
+            {
+              "Name": "obj",
+              "Type": "System.Object"
+            }
+          ],
+          "ReturnType": "System.Boolean",
+          "Virtual": true,
+          "Override": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "GetHashCode",
+          "Parameters": [],
+          "ReturnType": "System.Int32",
+          "Virtual": true,
+          "Override": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "ToString",
+          "Parameters": [],
+          "ReturnType": "System.String",
+          "Virtual": true,
+          "Override": true,
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    },
+    {
+      "Name": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefixCollection",
+      "Visibility": "Public",
+      "Kind": "Class",
+      "ImplementedInterfaces": [
+        "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>"
+      ],
+      "Members": [
+        {
+          "Kind": "Method",
+          "Name": "get_Count",
+          "Parameters": [],
+          "ReturnType": "System.Int32",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "get_IsReadOnly",
+          "Parameters": [],
+          "ReturnType": "System.Boolean",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Add",
+          "Parameters": [
+            {
+              "Name": "prefix",
+              "Type": "System.String"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Add",
+          "Parameters": [
+            {
+              "Name": "item",
+              "Type": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Clear",
+          "Parameters": [],
+          "ReturnType": "System.Void",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Contains",
+          "Parameters": [
+            {
+              "Name": "item",
+              "Type": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix"
+            }
+          ],
+          "ReturnType": "System.Boolean",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "CopyTo",
+          "Parameters": [
+            {
+              "Name": "array",
+              "Type": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix[]"
+            },
+            {
+              "Name": "arrayIndex",
+              "Type": "System.Int32"
+            }
+          ],
+          "ReturnType": "System.Void",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Remove",
+          "Parameters": [
+            {
+              "Name": "prefix",
+              "Type": "System.String"
+            }
+          ],
+          "ReturnType": "System.Boolean",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "Remove",
+          "Parameters": [
+            {
+              "Name": "item",
+              "Type": "Microsoft.AspNetCore.Server.HttpSys.UrlPrefix"
+            }
+          ],
+          "ReturnType": "System.Boolean",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.ICollection<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        },
+        {
+          "Kind": "Method",
+          "Name": "GetEnumerator",
+          "Parameters": [],
+          "ReturnType": "System.Collections.Generic.IEnumerator<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Sealed": true,
+          "Virtual": true,
+          "ImplementedInterface": "System.Collections.Generic.IEnumerable<Microsoft.AspNetCore.Server.HttpSys.UrlPrefix>",
+          "Visibility": "Public",
+          "GenericParameter": []
+        }
+      ],
+      "GenericParameters": []
+    }
+  ]
+}
\ No newline at end of file