WebView: intercepting outgoing POST request body.

Question

Hello,

I have a login web app embedded in a WebView that returns id tokens through a POST request which I would like to intercept and handle in my .net MAUI application. I am currently able to intercept the outgoing POST request by using the WebView Navigating event, but I am unable to retrieve the body of the request. WebNavigatingEventArgs doesn't seem to have any property that would contain this (see code snippet below).

   <WebView   
       Source="https://myLogin.WebApp?redirect_uri=https://example.com"  
       Navigating="OnWebViewNavigating"  
        />  
         
       ....  
         
       private void OnWebViewNavigating(object sender, WebNavigatingEventArgs e)  
       {  
           if (e.Url.StartsWith("https://example.com"))  
           {  
               e.Cancel = true;  
         
              //TODO get the POST request body and use the id token in my app  
                 
           }  
       }  

Am I proceeding correctly? If yes, how can I get the body of the POST request? Otherwise, how does one handle such a use case?

Thanks in advance.

Answer 1

Hello,

Is there any vision to normalize requests interception through the main, platform-agnostic MAUI library (I'm asking since WebViewClient.ShouldInterceptRequest is from Xamarin SDK)?

No, this is because intercepting HTTP requests depends on the WebView's API on the specific platform.

You could refer to Invoke platform code to get more details about how to access the required platform APIs.

The following documentations would be helpful for you:

• Android shouldInterceptRequest
• iOS WKURLSchemeHandler.
• Since the documentation for iOS is very brief, you can refer to the workarounds of this question: Intercept request with WKWebView.
• Windows Custom management of network requests.

Best Regards,

Alec Liu.

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