diff --git a/src/HttpClientFactory/Polly/src/HttpRequestMessageExtensions.cs b/src/HttpClientFactory/Polly/src/HttpRequestMessageExtensions.cs
index 39dd5b3b72fb..779d1f1f4ef4 100644
--- a/src/HttpClientFactory/Polly/src/HttpRequestMessageExtensions.cs
+++ b/src/HttpClientFactory/Polly/src/HttpRequestMessageExtensions.cs
@@ -26,7 +26,7 @@ public static class HttpRequestMessageExtensions
     /// to executing a <see cref="Policy"/>, if one does not already exist. The <see cref="Context"/> will be provided
     /// to the policy for use inside the <see cref="Policy"/> and in other message handlers.
     /// </remarks>
-    public static Context GetPolicyExecutionContext(this HttpRequestMessage request)
+    public static Context? GetPolicyExecutionContext(this HttpRequestMessage request)
     {
         if (request == null)
         {
@@ -47,7 +47,7 @@ public static Context GetPolicyExecutionContext(this HttpRequestMessage request)
     /// to executing a <see cref="Policy"/>, if one does not already exist. The <see cref="Context"/> will be provided
     /// to the policy for use inside the <see cref="Policy"/> and in other message handlers.
     /// </remarks>
-    public static void SetPolicyExecutionContext(this HttpRequestMessage request, Context context)
+    public static void SetPolicyExecutionContext(this HttpRequestMessage request, Context? context)
     {
         if (request == null)
         {
diff --git a/src/HttpClientFactory/Polly/src/Microsoft.Extensions.Http.Polly.csproj b/src/HttpClientFactory/Polly/src/Microsoft.Extensions.Http.Polly.csproj
index 2788a6591811..061acc9775d0 100644
--- a/src/HttpClientFactory/Polly/src/Microsoft.Extensions.Http.Polly.csproj
+++ b/src/HttpClientFactory/Polly/src/Microsoft.Extensions.Http.Polly.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Description>
@@ -13,7 +13,6 @@
     <ExcludeFromSourceBuild>true</ExcludeFromSourceBuild>
     <IsPackable>true</IsPackable>
     <IsShipping>true</IsShipping>
-    <Nullable>disable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/HttpClientFactory/Polly/src/PublicAPI.Shipped.txt b/src/HttpClientFactory/Polly/src/PublicAPI.Shipped.txt
index f415546a8da1..cd36b8065e3a 100644
--- a/src/HttpClientFactory/Polly/src/PublicAPI.Shipped.txt
+++ b/src/HttpClientFactory/Polly/src/PublicAPI.Shipped.txt
@@ -1,20 +1,20 @@
 #nullable enable
-~Microsoft.Extensions.Http.PolicyHttpMessageHandler.PolicyHttpMessageHandler(Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage> policy) -> void
-~Microsoft.Extensions.Http.PolicyHttpMessageHandler.PolicyHttpMessageHandler(System.Func<System.Net.Http.HttpRequestMessage, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage>> policySelector) -> void
-~override Microsoft.Extensions.Http.PolicyHttpMessageHandler.SendAsync(System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task<System.Net.Http.HttpResponseMessage>
-~static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder builder, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage> policy) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder
-~static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder builder, System.Func<System.IServiceProvider, System.Net.Http.HttpRequestMessage, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage>> policySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder
-~static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder builder, System.Func<System.IServiceProvider, System.Net.Http.HttpRequestMessage, string, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage>> policyFactory, System.Func<System.Net.Http.HttpRequestMessage, string> keySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder
-~static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder builder, System.Func<System.Net.Http.HttpRequestMessage, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage>> policySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder
-~static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandlerFromRegistry(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder builder, string policyKey) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder
-~static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandlerFromRegistry(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder builder, System.Func<Polly.Registry.IReadOnlyPolicyRegistry<string>, System.Net.Http.HttpRequestMessage, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage>> policySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder
-~static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddTransientHttpErrorPolicy(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder builder, System.Func<Polly.PolicyBuilder<System.Net.Http.HttpResponseMessage>, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage>> configurePolicy) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder
-~static Microsoft.Extensions.DependencyInjection.PollyServiceCollectionExtensions.AddPolicyRegistry(this Microsoft.Extensions.DependencyInjection.IServiceCollection services) -> Polly.Registry.IPolicyRegistry<string>
-~static Microsoft.Extensions.DependencyInjection.PollyServiceCollectionExtensions.AddPolicyRegistry(this Microsoft.Extensions.DependencyInjection.IServiceCollection services, Polly.Registry.IPolicyRegistry<string> registry) -> Polly.Registry.IPolicyRegistry<string>
-~static Microsoft.Extensions.DependencyInjection.PollyServiceCollectionExtensions.AddPolicyRegistry(this Microsoft.Extensions.DependencyInjection.IServiceCollection services, System.Action<System.IServiceProvider, Polly.Registry.IPolicyRegistry<string>> configureRegistry) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
-~static Polly.HttpRequestMessageExtensions.GetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage request) -> Polly.Context
-~static Polly.HttpRequestMessageExtensions.SetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage request, Polly.Context context) -> void
-~virtual Microsoft.Extensions.Http.PolicyHttpMessageHandler.SendCoreAsync(System.Net.Http.HttpRequestMessage request, Polly.Context context, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task<System.Net.Http.HttpResponseMessage>
+Microsoft.Extensions.Http.PolicyHttpMessageHandler.PolicyHttpMessageHandler(Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>! policy) -> void
+Microsoft.Extensions.Http.PolicyHttpMessageHandler.PolicyHttpMessageHandler(System.Func<System.Net.Http.HttpRequestMessage!, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>!>! policySelector) -> void
+override Microsoft.Extensions.Http.PolicyHttpMessageHandler.SendAsync(System.Net.Http.HttpRequestMessage! request, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task<System.Net.Http.HttpResponseMessage!>!
+static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder! builder, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>! policy) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder!
+static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder! builder, System.Func<System.IServiceProvider!, System.Net.Http.HttpRequestMessage!, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>!>! policySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder!
+static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder! builder, System.Func<System.IServiceProvider!, System.Net.Http.HttpRequestMessage!, string!, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>!>! policyFactory, System.Func<System.Net.Http.HttpRequestMessage!, string!>! keySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder!
+static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandler(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder! builder, System.Func<System.Net.Http.HttpRequestMessage!, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>!>! policySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder!
+static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandlerFromRegistry(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder! builder, string! policyKey) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder!
+static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddPolicyHandlerFromRegistry(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder! builder, System.Func<Polly.Registry.IReadOnlyPolicyRegistry<string!>!, System.Net.Http.HttpRequestMessage!, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>!>! policySelector) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder!
+static Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions.AddTransientHttpErrorPolicy(this Microsoft.Extensions.DependencyInjection.IHttpClientBuilder! builder, System.Func<Polly.PolicyBuilder<System.Net.Http.HttpResponseMessage!>!, Polly.IAsyncPolicy<System.Net.Http.HttpResponseMessage!>!>! configurePolicy) -> Microsoft.Extensions.DependencyInjection.IHttpClientBuilder!
+static Microsoft.Extensions.DependencyInjection.PollyServiceCollectionExtensions.AddPolicyRegistry(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services) -> Polly.Registry.IPolicyRegistry<string!>!
+static Microsoft.Extensions.DependencyInjection.PollyServiceCollectionExtensions.AddPolicyRegistry(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services, Polly.Registry.IPolicyRegistry<string!>! registry) -> Polly.Registry.IPolicyRegistry<string!>!
+static Microsoft.Extensions.DependencyInjection.PollyServiceCollectionExtensions.AddPolicyRegistry(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services, System.Action<System.IServiceProvider!, Polly.Registry.IPolicyRegistry<string!>!>! configureRegistry) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+static Polly.HttpRequestMessageExtensions.GetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage! request) -> Polly.Context!
+static Polly.HttpRequestMessageExtensions.SetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage! request, Polly.Context! context) -> void
+virtual Microsoft.Extensions.Http.PolicyHttpMessageHandler.SendCoreAsync(System.Net.Http.HttpRequestMessage! request, Polly.Context! context, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task<System.Net.Http.HttpResponseMessage!>!
 Microsoft.Extensions.DependencyInjection.PollyHttpClientBuilderExtensions
 Microsoft.Extensions.DependencyInjection.PollyServiceCollectionExtensions
 Microsoft.Extensions.Http.PolicyHttpMessageHandler
diff --git a/src/HttpClientFactory/Polly/src/PublicAPI.Unshipped.txt b/src/HttpClientFactory/Polly/src/PublicAPI.Unshipped.txt
index 7dc5c58110bf..dd50bb0c66ed 100644
--- a/src/HttpClientFactory/Polly/src/PublicAPI.Unshipped.txt
+++ b/src/HttpClientFactory/Polly/src/PublicAPI.Unshipped.txt
@@ -1 +1,5 @@
 #nullable enable
+*REMOVED*static Polly.HttpRequestMessageExtensions.GetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage! request) -> Polly.Context!
+*REMOVED*static Polly.HttpRequestMessageExtensions.SetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage! request, Polly.Context! context) -> void
+static Polly.HttpRequestMessageExtensions.GetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage! request) -> Polly.Context?
+static Polly.HttpRequestMessageExtensions.SetPolicyExecutionContext(this System.Net.Http.HttpRequestMessage! request, Polly.Context? context) -> void
diff --git a/src/SiteExtensions/Microsoft.Web.Xdt.Extensions/src/Microsoft.Web.Xdt.Extensions.csproj b/src/SiteExtensions/Microsoft.Web.Xdt.Extensions/src/Microsoft.Web.Xdt.Extensions.csproj
index 7985b489fad6..4133099e1116 100644
--- a/src/SiteExtensions/Microsoft.Web.Xdt.Extensions/src/Microsoft.Web.Xdt.Extensions.csproj
+++ b/src/SiteExtensions/Microsoft.Web.Xdt.Extensions/src/Microsoft.Web.Xdt.Extensions.csproj
@@ -6,6 +6,7 @@
     <CopySymbolsToArtifacts>true</CopySymbolsToArtifacts>
     <IsPackable>false</IsPackable>
     <IsShippingPackage>false</IsShippingPackage>
+    <!-- Nullable disabled because package only targets .NET Framework. -->
     <Nullable>disable</Nullable>
   </PropertyGroup>
 
diff --git a/src/Tools/GetDocumentInsider/src/GetDocument.Insider.csproj b/src/Tools/GetDocumentInsider/src/GetDocument.Insider.csproj
index f16e884f76f3..70b25e68309c 100644
--- a/src/Tools/GetDocumentInsider/src/GetDocument.Insider.csproj
+++ b/src/Tools/GetDocumentInsider/src/GetDocument.Insider.csproj
@@ -7,7 +7,6 @@
     <RootNamespace>Microsoft.Extensions.ApiDescription.Tool</RootNamespace>
     <TargetFrameworks>netcoreapp2.1;$(DefaultNetCoreTargetFramework);$(DefaultNetFxTargetFramework)</TargetFrameworks>
     <IsShippingPackage>false</IsShippingPackage>
-    <Nullable>disable</Nullable>
     <NoWarn>$(NoWarn);nullable</NoWarn>
   </PropertyGroup>