Surface JSON serialize content and version >=2.1 (dotnet#16217)

Author: guardrex

aspnetcore/fundamentals/http-requests.md

@@ -2,9 +2,10 @@
 title: Make HTTP requests using IHttpClientFactory in ASP.NET Core
 author: stevejgordon
 description: Learn about using the IHttpClientFactory interface to manage logical HttpClient instances in ASP.NET Core.
+monikerRange: '>= aspnetcore-2.1'
 ms.author: scaddie
 ms.custom: mvc
-ms.date: 11/27/2019
+ms.date: 12/16/2019
 uid: fundamentals/http-requests
 ---
 # Make HTTP requests using IHttpClientFactory in ASP.NET Core
@@ -351,6 +352,7 @@ In the following example:
 * [Use HttpClientFactory to implement resilient HTTP requests](/dotnet/standard/microservices-architecture/implement-resilient-applications/use-httpclientfactory-to-implement-resilient-http-requests)
 * [Implement HTTP call retries with exponential backoff with HttpClientFactory and Polly policies](/dotnet/standard/microservices-architecture/implement-resilient-applications/implement-http-call-retries-exponential-backoff-polly)
 * [Implement the Circuit Breaker pattern](/dotnet/standard/microservices-architecture/implement-resilient-applications/implement-circuit-breaker-pattern)
+* [How to serialize and deserialize JSON in .NET](/dotnet/standard/serialization/system-text-json-how-to)
 
 ::: moniker-end
 
@@ -655,7 +657,7 @@ In the following example:
 
 ::: moniker-end
 
-::: moniker range="<= aspnetcore-2.1"
+::: moniker range="= aspnetcore-2.1"
 
 By [Glenn Condron](https://github.com/glennc), [Ryan Nowak](https://github.com/rynowak), and [Steve Gordon](https://github.com/stevejgordon)