diff --git a/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/ServerVariables.cs b/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/ServerVariables.cs
index 2b44331a15..afb3a72053 100644
--- a/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/ServerVariables.cs
+++ b/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/ServerVariables.cs
@@ -38,51 +38,51 @@ namespace Microsoft.AspNetCore.Rewrite.Internal.ApacheModRewrite
                 case "HTTP_FORWARDED":
                     return new HeaderSegment("Forwarded");
                 case "AUTH_TYPE":
-                    throw new NotSupportedException("Rules using the AUTH_TYPE server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "CONN_REMOTE_ADDR":
                     return new RemoteAddressSegment();
                 case "CONTEXT_PREFIX":
-                    throw new NotSupportedException("Rules using the CONTEXT_PREFIX server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "CONTEXT_DOCUMENT_ROOT":
-                    throw new NotSupportedException("Rules using the CONTEXT_DOCUMENT_ROOT server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "IPV6":
                     return new IsIPV6Segment();
                 case "PATH_INFO":
-                    throw new NotImplementedException("Rules using the PATH_INFO server variable are not implemented");
+                    throw new NotImplementedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "QUERY_STRING":
                     return new QueryStringSegment();
                 case "REMOTE_ADDR":
                     return new RemoteAddressSegment();
                 case "REMOTE_HOST":
-                    throw new NotSupportedException("Rules using the REMOTE_HOST server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "REMOTE_IDENT":
-                    throw new NotSupportedException("Rules using the REMOTE_IDENT server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "REMOTE_PORT":
                     return new RemotePortSegment();
                 case "REMOTE_USER":
-                    throw new NotSupportedException("Rules using the REMOTE_USER server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "REQUEST_METHOD":
                     return new RequestMethodSegment();
                 case "SCRIPT_FILENAME":
                     return new RequestFileNameSegment();
                 case "DOCUMENT_ROOT":
-                    throw new NotSupportedException("Rules using the DOCUMENT_ROOT server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "SCRIPT_GROUP":
-                    throw new NotSupportedException("Rules using the SCRIPT_GROUP server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "SCRIPT_USER":
-                    throw new NotSupportedException("Rules using the SCRIPT_USER server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "SERVER_ADDR":
                     return new LocalAddressSegment();
                 case "SERVER_ADMIN":
-                    throw new NotSupportedException("Rules using the SERVER_ADMIN server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "SERVER_NAME":
-                    throw new NotSupportedException("Rules using the SERVER_NAME server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "SERVER_PORT":
                     return new LocalPortSegment();
                 case "SERVER_PROTOCOL":
                     return new ServerProtocolSegment();
                 case "SERVER_SOFTWARE":
-                    throw new NotSupportedException("Rules using the SERVER_SOFTWARE server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "TIME_YEAR":
                     return new DateTimeSegment(serverVariable);
                 case "TIME_MON":
@@ -100,13 +100,13 @@ namespace Microsoft.AspNetCore.Rewrite.Internal.ApacheModRewrite
                 case "TIME":
                     return new DateTimeSegment(serverVariable);
                 case "API_VERSION":
-                    throw new NotSupportedException("Rules using the API_VERSION server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "HTTPS":
                     return new IsHttpsModSegment();
                 case "HTTP2":
-                    throw new NotSupportedException("Rules using the HTTP2 server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "IS_SUBREQ":
-                    throw new NotSupportedException("Rules using the IS_SUBREQ server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "REQUEST_FILENAME":
                     return new RequestFileNameSegment();
                 case "REQUEST_SCHEME":
@@ -114,7 +114,7 @@ namespace Microsoft.AspNetCore.Rewrite.Internal.ApacheModRewrite
                 case "REQUEST_URI":
                     return new UrlSegment();
                 case "THE_REQUEST":
-                    throw new NotSupportedException("Rules using the THE_REQUEST server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 default:
                     throw new FormatException(Resources.FormatError_InputParserUnrecognizedParameter(serverVariable, context.Index));
             }
diff --git a/src/Microsoft.AspNetCore.Rewrite/Internal/IISUrlRewrite/ServerVariables.cs b/src/Microsoft.AspNetCore.Rewrite/Internal/IISUrlRewrite/ServerVariables.cs
index a9c92a9a6c..12367e142c 100644
--- a/src/Microsoft.AspNetCore.Rewrite/Internal/IISUrlRewrite/ServerVariables.cs
+++ b/src/Microsoft.AspNetCore.Rewrite/Internal/IISUrlRewrite/ServerVariables.cs
@@ -15,9 +15,9 @@ namespace Microsoft.AspNetCore.Rewrite.Internal.IISUrlRewrite
             {
                 // TODO Add all server variables here.
                 case "ALL_RAW":
-                    throw new NotSupportedException("Rules using the ALL_RAW server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "APP_POOL_ID":
-                    throw new NotSupportedException("Rules using the APP_POOL_ID server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "CONTENT_LENGTH":
                     return new HeaderSegment(HeaderNames.ContentLength);
                 case "CONTENT_TYPE":
@@ -41,13 +41,13 @@ namespace Microsoft.AspNetCore.Rewrite.Internal.IISUrlRewrite
                 case "LOCAL_ADDR":
                     return new LocalAddressSegment();
                 case "HTTP_PROXY_CONNECTION":
-                    throw new NotSupportedException("Rules using the HTTP_PROXY_CONNECTION server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "QUERY_STRING":
                     return new QueryStringSegment();
                 case "REMOTE_ADDR":
                     return new RemoteAddressSegment();
                 case "REMOTE_HOST":
-                    throw new NotSupportedException("Rules using the REMOTE_HOST server variable are not supported");
+                    throw new NotSupportedException(Resources.FormatError_UnsupportedServerVariable(serverVariable));
                 case "REMOTE_PORT":
                     return new RemotePortSegment();
                 case "REQUEST_FILENAME":
diff --git a/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs b/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs
index bda94e5268..f52b4232a8 100644
--- a/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs
+++ b/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs
@@ -202,6 +202,22 @@ namespace Microsoft.AspNetCore.Rewrite
             return string.Format(CultureInfo.CurrentCulture, GetString("Error_UrlRewriteParseError"), p0, p1, p2);
         }
 
+        /// <summary>
+        /// Rules using the '{0}' server variable are not supported
+        /// </summary>
+        internal static string Error_UnsupportedServerVariable
+        {
+            get { return GetString("Error_UnsupportedServerVariable"); }
+        }
+
+        /// <summary>
+        /// Rules using the '{0}' server variable are not supported
+        /// </summary>
+        internal static string FormatError_UnsupportedServerVariable(object p0)
+        {
+            return string.Format(CultureInfo.CurrentCulture, GetString("Error_UnsupportedServerVariable"), p0);
+        }
+
         private static string GetString(string name, params string[] formatterNames)
         {
             var value = _resourceManager.GetString(name);
diff --git a/src/Microsoft.AspNetCore.Rewrite/Resources.resx b/src/Microsoft.AspNetCore.Rewrite/Resources.resx
index 2c68d33ec3..7574b71b2f 100644
--- a/src/Microsoft.AspNetCore.Rewrite/Resources.resx
+++ b/src/Microsoft.AspNetCore.Rewrite/Resources.resx
@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
-  <!--
-    Microsoft ResX Schema
-
+  <!-- 
+    Microsoft ResX Schema 
+    
     Version 2.0
-
-    The primary goals of this format is to allow a simple XML format
-    that is mostly human readable. The generation and parsing of the
-    various data types are done through the TypeConverter classes
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
     associated with the data types.
-
+    
     Example:
-
+    
     ... ado.net/XML headers & schema ...
     <resheader name="resmimetype">text/microsoft-resx</resheader>
     <resheader name="version">2.0</resheader>
@@ -26,36 +26,36 @@
         <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
         <comment>This is a comment</comment>
     </data>
-
-    There are any number of "resheader" rows that contain simple
+                
+    There are any number of "resheader" rows that contain simple 
     name/value pairs.
-
-    Each data row contains a name, and value. The row also contains a
-    type or mimetype. Type corresponds to a .NET class that support
-    text/value conversion through the TypeConverter architecture.
-    Classes that don't support this are serialized and stored with the
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
     mimetype set.
-
-    The mimetype is used for serialized objects, and tells the
-    ResXResourceReader how to depersist the object. This is currently not
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
     extensible. For a given mimetype the value must be set accordingly:
-
-    Note - application/x-microsoft.net.object.binary.base64 is the format
-    that the ResXResourceWriter will generate, however the reader can
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
     read any of the formats listed below.
-
+    
     mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with
+    value   : The object must be serialized with 
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
-
+    
     mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with
+    value   : The object must be serialized with 
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
             : and then encoded with base64 encoding.
 
     mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array
+    value   : The object must be serialized into a byte array 
             : using a System.ComponentModel.TypeConverter
             : and then encoded with base64 encoding.
     -->
@@ -153,4 +153,7 @@
   <data name="Error_UrlRewriteParseError" xml:space="preserve">
     <value>Could not parse the UrlRewrite file. Message: '{0}'. Line number '{1}': '{2}'.</value>
   </data>
+  <data name="Error_UnsupportedServerVariable" xml:space="preserve">
+    <value>Rules using the '{0}' server variable are not supported</value>
+  </data>
 </root>
\ No newline at end of file