CODEWITHSUNDEEP
c#postwebviewuwprequest
yosi madsu
yosi madsu

Reputation: 314

UWP intercept Webview POST request and get the content

Using UWP/XAML, I'm trying to intercept WebView's POST (form and file upload) request by handling WebResourceRequested and get the contents to be saved, but the Content keep shows '<unbuffered>' in the Local Window and cannot be accessed. How can I get access to the Content?

private void WebView_WebResourceRequested(WebView sender, WebViewWebResourceRequestedEventArgs args)
{
    if (request.Method.Method == "POST")
    {
        HttpStreamContent content = (HttpStreamContent) args.request.Content;
        var contentBuffer = content.ReadAsBufferAsync().GetResults();
        byte[] buffer = contentBuffer.ToArray();
    }                    
}

Thank you very much.

Upvotes: 0

Views: 485

Answers (1)

Nico Zhu
Nico Zhu

Reputation: 32775

UWP intercept Webview POST request and get the content

This is know issue in WebView1. Currently, we provided a workaround that use ReadAsInputStreamAsync to get request content and use fixed length to load buffer. Because it is un-seek stream. I tested with success on the simple repro sample we have.

 private async void MyWebView_WebResourceRequested(WebView sender, WebViewWebResourceRequestedEventArgs args)
    {

        if (args.Request.Method.Method == "POST")
        {

            if (args.Request.Content != null)
            {
                var bodyStream = await args.Request.Content.ReadAsInputStreamAsync();
                var buffer = new Windows.Storage.Streams.Buffer(4096);
                await bodyStream.ReadAsync(buffer, 4096, Windows.Storage.Streams.InputStreamOptions.None);
                var reader = Windows.Storage.Streams.DataReader.FromBuffer(buffer);
                var len = reader.UnconsumedBufferLength;
                var body = reader.ReadString(len);

                Debug.WriteLine($"Body from POST request: {body}");

            }            
        }
    }

Of course, this code will work as long as we provide a buffer large enough for the post data. Here a buffer of 4096 bytes is enough to get the entire data posted, for this sample.

Upvotes: 2

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