Test failure - SendAsync_RequestVersion20_ResponseVersion20 (#112232)

* Change server to httpbin
* Update Http2NoPushHost and add Http2NoPushGetUris for improved testing

src/libraries/Common/tests/System/Net/Configuration.Http.cs

@@ -21,7 +21,7 @@ public static partial class Http
 
             // This server doesn't use HTTP/2 server push (push promise) feature. Some HttpClient implementations
             // don't support servers that use push right now.
-            public static string Http2NoPushHost => GetValue("DOTNET_TEST_HTTP2NOPUSHHOST", "www.microsoft.com");
+            public static string Http2NoPushHost => GetValue("DOTNET_TEST_HTTP2NOPUSHHOST", "httpbin.org");
 
             // Domain server environment.
             public static string DomainJoinedHttpHost => GetValue("DOTNET_TEST_DOMAINJOINED_HTTPHOST");
@@ -106,6 +106,7 @@ public static Uri[] GetEchoServerList()
 
             public static readonly object[][] Http2Servers = { new object[] { new Uri("https://" + Http2Host) } };
             public static readonly object[][] Http2NoPushServers = { new object[] { new Uri("https://" + Http2NoPushHost) } };
+            public static readonly object[][] Http2NoPushGetUris = { new object[] { new Uri("https://" + Http2NoPushHost + "/get") } };
 
             public static readonly RemoteServer RemoteHttp11Server = new RemoteServer(new Uri("http://" + Host + "/"), HttpVersion.Version11);
             public static readonly RemoteServer RemoteSecureHttp11Server = new RemoteServer(new Uri("https://" + SecureHost + "/"), HttpVersion.Version11);

src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.RemoteServer.cs

@@ -31,6 +31,7 @@ public sealed class HttpClientHandler_RemoteServerTest : HttpClientHandlerTestBa
 
         public static readonly object[][] Http2Servers = Configuration.Http.Http2Servers;
         public static readonly object[][] Http2NoPushServers = Configuration.Http.Http2NoPushServers;
+        public static readonly object[][] Http2NoPushGetUris = Configuration.Http.Http2NoPushGetUris;
 
         // Standard HTTP methods defined in RFC7231: http://tools.ietf.org/html/rfc7231#section-4.3
         //     "GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS", "TRACE"
@@ -1365,7 +1366,7 @@ public async Task SendAsync_RequestVersion20_ResponseVersion20IfHttp2Supported(U
         }
 
         [OuterLoop("Uses external servers")]
-        [ConditionalTheory(nameof(IsWindows10Version1607OrGreater)), MemberData(nameof(Http2NoPushServers))]
+        [ConditionalTheory(nameof(IsWindows10Version1607OrGreater)), MemberData(nameof(Http2NoPushGetUris))]
         public async Task SendAsync_RequestVersion20_ResponseVersion20(Uri server)
         {
             // Sync API supported only up to HTTP/1.1