protected virtual async Task HandleWebResourceRequest(ICoreWebView2WebResourceRequestedEventArgsWrapper eventArgs)
{
// Unlike server-side code, we get told exactly why the browser is making the request,
// so we can be smarter about fallback. We can ensure that 'fetch' requests never result
// in fallback, for example.
var allowFallbackOnHostPage =
eventArgs.ResourceContext == CoreWebView2WebResourceContextWrapper.Document ||
eventArgs.ResourceContext == CoreWebView2WebResourceContextWrapper.Other; // e.g., dev tools requesting page source
var requestUri = QueryStringHelper.RemovePossibleQueryString(eventArgs.Request.Uri);
// First, call into WebViewManager to see if it has a framework file for this request. It will
// fall back to an IFileProvider, but on WinUI it's always a NullFileProvider, so that will never
// return a file.
if (TryGetResponseContent(requestUri, allowFallbackOnHostPage, out var statusCode, out var statusMessage, out var content, out var headers))
{
// NOTE: This is stream copying is to work around a hanging bug in WinRT with managed streams
var memStream = new MemoryStream();
content.CopyTo(memStream);
var ms = new InMemoryRandomAccessStream();
await ms.WriteAsync(memStream.GetWindowsRuntimeBuffer());
var headerString = GetHeaderString(headers);
eventArgs.SetResponse(ms, statusCode, statusMessage, headerString);
}
}
protected override async Task HandleWebResourceRequest(ICoreWebView2WebResourceRequestedEventArgsWrapper eventArgs)
{
// Unlike server-side code, we get told exactly why the browser is making the request,
// so we can be smarter about fallback. We can ensure that 'fetch' requests never result
// in fallback, for example.
var allowFallbackOnHostPage =
eventArgs.ResourceContext == CoreWebView2WebResourceContextWrapper.Document ||
eventArgs.ResourceContext == CoreWebView2WebResourceContextWrapper.Other; // e.g., dev tools requesting page source
// Get a deferral object so that WebView2 knows there's some async stuff going on. We call Complete() at the end of this method.
using var deferral = eventArgs.GetDeferral();
// First, call into WebViewManager to see if it has a framework file for this request. It will
// fall back to an IFileProvider, but on WinUI it's always a NullFileProvider, so that will never
// return a file.
if (TryGetResponseContent(eventArgs.Request.Uri, allowFallbackOnHostPage, out var statusCode, out var statusMessage, out var content, out var headers) &&
statusCode != 404)
{
// NOTE: This is stream copying is to work around a hanging bug in WinRT with managed streams.
// See issue https://github.com/microsoft/CsWinRT/issues/670
var memStream = new MemoryStream();
content.CopyTo(memStream);
var ms = new InMemoryRandomAccessStream();
await ms.WriteAsync(memStream.GetWindowsRuntimeBuffer());
var headerString = GetHeaderString(headers);
eventArgs.SetResponse(ms, statusCode, statusMessage, headerString);
}
