Only use the DefaultHttpContext if options aren't explicitly specified.

Author: davidfowl

src/Http/Http/src/Features/FormFeature.cs

@@ -32,10 +32,15 @@ public FormFeature(IFormCollection form)
             Form = form;
         }
         public FormFeature(HttpRequest request)
-            : this(request, DefaultFormOptions)
+            : this(request, GetDefaults(request))
         {
         }
 
+        private static FormOptions GetDefaults(HttpRequest request)
+        {
+            return (request.HttpContext as DefaultHttpContext)?.FormOptions ?? DefaultFormOptions;
+        }
+
         public FormFeature(HttpRequest request, FormOptions options)
         {
             if (request == null)
@@ -48,7 +53,7 @@ public FormFeature(HttpRequest request, FormOptions options)
             }
 
             _request = request;
-            _options = (request.HttpContext is DefaultHttpContext defaultHttpContext) ? defaultHttpContext.FormOptions ?? options : options;
+            _options = options;
         }
 
         private MediaTypeHeaderValue ContentType