Fixed some comments referencing HttpWeb[Request/Response] and fixed a…

… test that was adding headers twice.

src/Hl7.Fhir.Core.Tests/Rest/FhirClientTests.cs

@@ -850,25 +850,20 @@ public void TestBinaryDetection()
         public void RequestFullResource()
         {
             var client = new FhirClient(testEndpoint);
-            var minimal = false;
-            client.OnBeforeRequest += (object s, BeforeRequestEventArgs e) => e.RawRequest.Headers.TryAddWithoutValidation("Prefer", minimal ? "return=minimal" : "return=representation");
 
             var result = client.Read<Patient>("Patient/glossy");
             Assert.IsNotNull(result);
             result.Id = null;
             result.Meta = null;
 
             client.PreferredReturn = Prefer.ReturnRepresentation;
-            minimal = false;
             var posted = client.Create(result);
             Assert.IsNotNull(posted, "Patient example not found");
 
-            minimal = true;     // simulate a server that does not return a body, even if ReturnFullResource = true
             posted = client.Create(result);
             Assert.IsNotNull(posted, "Did not return a resource, even when ReturnFullResource=true");
 
             client.PreferredReturn = Prefer.ReturnMinimal;
-            minimal = true;
             posted = client.Create(result);
             Assert.IsNull(posted);
         }

src/Hl7.Fhir.Core/Rest/FhirClient.cs

@@ -1025,7 +1025,7 @@ private void setResourceBase(Resource resource, string baseUri)
         public event EventHandler<AfterResponseEventArgs> OnAfterResponse;
 
         /// <summary>
-        /// Inspect or modify the HttpWebRequest just before the FhirClient issues a call to the server
+        /// Inspect or modify the <see cref="HttpRequestMessage"/> just before the FhirClient issues a call to the server
         /// </summary>
         /// <param name="rawRequest">The request as it is about to be sent to the server</param>
         /// <param name="body">The data in the body of the request as it is about to be sent to the server</param>
@@ -1036,9 +1036,9 @@ protected virtual void BeforeRequest(HttpRequestMessage rawRequest, byte[] body)
         }
 
         /// <summary>
-        /// Inspect the HttpWebResponse as it came back from the server
+        /// Inspect the <see cref="HttpResponseMessage"/> as it came back from the server
         /// </summary>
-        /// <remarks>You cannot read the body from the HttpWebResponse, since it has
+        /// <remarks>You cannot read the body from the HttpResponseMessage, since it has
         /// already been read by the framework. Use the body parameter instead.</remarks>
         protected virtual void AfterResponse(HttpResponseMessage webResponse, byte[] body)
         {