Update NavigateWithWebResourceRequest.md

Author: Çağrı Kaan Yıldırım

specs/NavigateWithWebResourceRequest.md

@@ -1,6 +1,6 @@
 
 # Background
-Consumers of the old WebBrowser control that relied on the [Navigate](https://docs.microsoft.com/en-us/previous-versions/aa752133(v=vs.85) API that allowed them to specify HTTP POST data and extra headers as part of navigation, [requested](https://github.com/MicrosoftEdge/WebViewFeedback/issues/69) same ability in WebView2. 
+Consumers of the old WebBrowser control that relied on the [Navigate](https://docs.microsoft.com/en-us/previous-versions/aa752133(v=vs.85)) API that allowed them to specify HTTP POST data and extra headers as part of navigation, [requested](https://github.com/MicrosoftEdge/WebViewFeedback/issues/69) same ability in WebView2. 
 
 # Description
 We propose adding NavigateWithWebResourceRequest to CoreWebView2 as the API that allows a WebView2 to navigate with a specified [CoreWebView2WebResourceRequest](https://docs.microsoft.com/en-us/microsoft-edge/webview2/reference/dotnet/0-9-628/microsoft-web-webview2-core-corewebview2). This allows the developer to specify extra headers and POST data as part of their request for navigation.
@@ -11,11 +11,16 @@ We also propose adding a CreateWebResourceRequest API to [CoreWebView2Environmen
 ```cpp
     // Need to convert post data to UTF-8 as required by the application/x-www-form-urlencoded Content-Type 
     std::wstring postData = std::wstring(L"input=Hello");
-    char* postDataString = new char[postData.length()];
-    WideCharToMultiByte(
-        CP_UTF8, 0, postData.c_str(), postData.length(), postDataString, postData.length(),
+    int sizeNeededForMultiByte = WideCharToMultiByte(
+        CP_UTF8, 0, postData.c_str(), -1, nullptr,
+        0,
         nullptr, nullptr);
 
+    char* postDataString = new char[sizeNeededForMultiByte];
+    WideCharToMultiByte(
+        CP_UTF8, 0, postData.c_str(), -1, postDataString, sizeNeededForMultiByte, nullptr,
+        nullptr);
+
     wil::com_ptr<ICoreWebView2WebResourceRequest> webResourceRequest;
     wil::com_ptr<IStream> postDataStream = SHCreateMemStream(
         reinterpret_cast<const BYTE*>(postDataString), postData.length());
@@ -65,9 +70,8 @@ with a "///" comment above the member or type. -->
 # API Details
 <!-- The exact API, in MIDL3 format (https://docs.microsoft.com/en-us/uwp/midl-3/) -->
 ```idl
-// This is the ICoreWebView2 Staging interface.
-[uuid(9810c82b-8483-4f1c-b2f4-6244f1010c05), object, pointer_default(unique)]
-interface ICoreWebView2Staging : IUnknown {
+[uuid(7fbad153-fb94-452e-acab-3cbb9ab341ec), object, pointer_default(unique)]
+interface ICoreWebView2_2 : ICoreWebView2 {
  ....
   /// Navigate using a constructed WebResourceRequest object. This let's you
   /// provide post data or additional request headers during navigation.
@@ -80,9 +84,8 @@ interface ICoreWebView2Staging : IUnknown {
   HRESULT NavigateWithWebResourceRequest([in] ICoreWebView2WebResourceRequest* request);
 }
 
-// This is the ICoreWebView2Environment Staging interface.
-[uuid(512e6181-6e99-4744-9b75-183fbefb090b), object, pointer_default(unique)]
-interface ICoreWebView2StagingEnvironment : IUnknown {
+[uuid(1c11735a-d57d-4614-a9e1-8b48d81da38c), object, pointer_default(unique)]
+interface ICoreWebView2Environment_2 : IUnknown {
   /// Create a new web resource request object.
   /// URI parameter must be absolute URI.
   /// The headers string is the raw request header string delimited by newline