diff --git a/.gitignore b/.gitignore
index abc642dc8d..4b5208332f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,4 +30,5 @@ project.lock.json
 .testPublish/
 .idea/
 .vscode/
-
+*.nuget.props
+*.nuget.targets
diff --git a/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/RuleBuilder.cs b/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/RuleBuilder.cs
index e9bc6b36df..8e93d1db16 100644
--- a/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/RuleBuilder.cs
+++ b/src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/RuleBuilder.cs
@@ -178,8 +178,7 @@ namespace Microsoft.AspNetCore.Rewrite.Internal.ApacheModRewrite
 
             if (flags.GetValue(FlagType.Env, out flag))
             {
-                // parse env
-                _actions.Add(new ChangeEnvironmentAction(flag));
+                throw new NotSupportedException(Resources.Error_ChangeEnvironmentNotSupported);
             }
 
             if (flags.HasFlag(FlagType.Forbidden))
diff --git a/src/Microsoft.AspNetCore.Rewrite/Internal/UrlActions/ChangeEnvironmentAction.cs b/src/Microsoft.AspNetCore.Rewrite/Internal/UrlActions/ChangeEnvironmentAction.cs
deleted file mode 100644
index c0b314a643..0000000000
--- a/src/Microsoft.AspNetCore.Rewrite/Internal/UrlActions/ChangeEnvironmentAction.cs
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System;
-
-namespace Microsoft.AspNetCore.Rewrite.Internal.UrlActions
-{
-    public class ChangeEnvironmentAction : UrlAction
-    {
-        public ChangeEnvironmentAction(string env)
-        {
-            // TODO
-            throw new NotImplementedException("Changing the environment is not implemented");
-        }
-
-        public override void ApplyAction(RewriteContext context, MatchResults ruleMatch, MatchResults condMatch)
-        {
-            // Do stuff to modify the env
-            throw new NotImplementedException("Changing the environment is not implemented");
-        }
-    }
-}
diff --git a/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs b/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs
index 25261d8664..3c2e0d6b64 100644
--- a/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs
+++ b/src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs
@@ -154,6 +154,22 @@ namespace Microsoft.AspNetCore.Rewrite
             return GetString("Error_IntegerMatch_FormatExceptionMessage");
         }
 
+        /// <summary>
+        /// Error adding a mod_rewrite rule. The change environment flag is not supported.
+        /// </summary>
+        internal static string Error_ChangeEnvironmentNotSupported
+        {
+            get { return GetString("Error_ChangeEnvironmentNotSupported"); }
+        }
+
+        /// <summary>
+        /// Error adding a mod_rewrite rule. The change environment flag is not supported.
+        /// </summary>
+        internal static string FormatError_ChangeEnvironmentNotSupported()
+        {
+            return GetString("Error_ChangeEnvironmentNotSupported");
+        }
+
         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 70a314f06b..7b477cc447 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.
     -->
@@ -144,4 +144,7 @@
   <data name="Error_IntegerMatch_FormatExceptionMessage" xml:space="preserve">
     <value>Syntax error for integers in comparison.</value>
   </data>
+  <data name="Error_ChangeEnvironmentNotSupported" xml:space="preserve">
+    <value>Error adding a mod_rewrite rule. The change environment flag is not supported.</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/test/Microsoft.AspNetCore.Rewrite.Tests/ApacheModRewrite/RuleBuilderTest.cs b/test/Microsoft.AspNetCore.Rewrite.Tests/ApacheModRewrite/RuleBuilderTest.cs
new file mode 100644
index 0000000000..df1a16adf1
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Rewrite.Tests/ApacheModRewrite/RuleBuilderTest.cs
@@ -0,0 +1,24 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using Microsoft.AspNetCore.Rewrite.Internal.ApacheModRewrite;
+using Xunit;
+
+namespace Microsoft.AspNetCore.Rewrite.Tests
+{
+    public class RuleBuilderTest
+    {
+        [Fact]
+        // see https://httpd.apache.org/docs/2.4/rewrite/advanced.html#setenvvars
+        public void AddAction_Throws_ChangeEnvNotSupported()
+        {
+            var builder = new RuleBuilder();
+            var flags = new Flags();
+            flags.SetFlag(FlagType.Env, "rewritten:1");
+
+            var ex = Assert.Throws<NotSupportedException>(() => builder.AddAction(null, flags));
+            Assert.Equal(Resources.Error_ChangeEnvironmentNotSupported, ex.Message);
+        }
+    }
+}
\ No newline at end of file