Use Util for detecting WASM

Author: wtgodbe

src/SignalR/clients/csharp/Http.Connections.Client/src/Internal/Utils.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Runtime.InteropServices;
 
 namespace Microsoft.AspNetCore.Http.Connections.Client.Internal
 {
@@ -41,5 +42,10 @@ internal static Uri AppendQueryString(Uri url, string qs)
             builder.Query = newQueryString;
             return builder.Uri;
         }
+
+        internal static bool IsRunningBlazorWasm()
+        {
+            return RuntimeInformation.IsOSPlatform(OSPlatform.Create("WEBASSEMBLY"));
+        }
     }
 }

src/SignalR/clients/csharp/Http.Connections.Client/src/Internal/WebSocketsTransport.cs

@@ -108,16 +108,14 @@ public async Task StartAsync(Uri url, TransferFormat transferFormat, Cancellatio
 
             var resolvedUrl = ResolveWebSocketsUrl(url);
 
-            var isWasm = RuntimeInformation.IsOSPlatform(OSPlatform.Create("WEBASSEMBLY"));
-
             // We don't need to capture to a local because we never change this delegate.
             if (_accessTokenProvider != null)
             {
                 var accessToken = await _accessTokenProvider();
                 if (!string.IsNullOrEmpty(accessToken))
                 {
                     // We can't use request headers in the browser, so instead append the token as a query string if running WASM
-                    if (isWasm)
+                    if (Utils.IsRunningBlazorWasm())
                     {
                         var accessTokenEncoded = UrlEncoder.Default.Encode(accessToken);
                         accessTokenEncoded = "access_token=" + accessTokenEncoded;