I'm trying to intercept and modify the content of the response before it is rendered in webview

[bmanigandan07]

Unable to find the way to intercept the response received from the server, so that I can read the content and modify the values and sent it to the webview controller to render the modified content.

Used the below API, but cannot read the response content as it is always NULL.

EventRegistrationToken webResourceToken;
m_webView->AddWebResourceRequestedFilter(
	L"https://www.example.com",
	COREWEBVIEW2_WEB_RESOURCE_CONTEXT_ALL);

m_webView->add_WebResourceRequested(
	Callback<ICoreWebView2WebResourceRequestedEventHandler>(
		[this](ICoreWebView2* sender, ICoreWebView2WebResourceRequestedEventArgs* args) -> HRESULT {

			wil::com_ptr<ICoreWebView2WebResourceRequest> webResourceRequest;
			args->get_Request(&webResourceRequest);

			wil::unique_cotaskmem_string uri;
			webResourceRequest->get_Uri(&uri);
			std::wstring source(uri.get());

			LOG_INFO_FMT(L"event triggered for URL -> %s", source.c_str());

			// The response object as received
			wil::com_ptr<ICoreWebView2WebResourceResponse> webResourceResponse;
			args->get_Response(&webResourceResponse);
			
			//unable to perform operations in member object as webResourceResponse->get_StatusCode() and webResourceResponse->get_Content always returns null
			
			return S_OK;
		}).Get(),
			&webResourceToken);

Also, used the below API's and able to read all the response headers and content, but cannot intercept the response. Microsoft stated that modifying the response object does not affect the webview window output.

wil::com_ptr<ICoreWebView2_2> webView2_2;
m_webView->QueryInterface(IID_PPV_ARGS(&webView2_2));


EventRegistrationToken m_webResourceResponseReceivedToken = {};

webView2_2->add_WebResourceResponseReceived(
	Callback<ICoreWebView2WebResourceResponseReceivedEventHandler>(
		[this](ICoreWebView2* sender, ICoreWebView2WebResourceResponseReceivedEventArgs* args)
		-> HRESULT {

			// The request object as committed
			wil::com_ptr<ICoreWebView2WebResourceRequest> webResourceRequest;
			args->get_Request(&webResourceRequest);

			// The response object as received
			wil::com_ptr<ICoreWebView2WebResourceResponseView> webResourceResponse;
			args->get_Response(&webResourceResponse);

			wil::unique_cotaskmem_string uri;
			webResourceRequest->get_Uri(&uri);
			std::wstring source(uri.get());

			LOG_INFO_FMT(L"Response received event triggered for %s", source.c_str());

			if (source.compare(L"https://www.example.com") == 0)
			{                                           
				// Get body content for the response
				webResourceResponse->GetContent(
					Callback<
					ICoreWebView2WebResourceResponseViewGetContentCompletedHandler>(
						[this, webResourceRequest, webResourceResponse, args](HRESULT result, IStream* content) {

							wil::unique_cotaskmem_string uri;
							webResourceRequest->get_Uri(&uri);
							std::wstring source(uri.get());

								// The stream will be null if no content was found for the response.
								if (content) {
									bool isSuccess = false;
									std::wstring wstr = IStreamToWString(content, isSuccess);
									LOG_INFO_FMT(L"content of URL is %s is %s", source.c_str(), wstr.c_str());

								}
							return S_OK;
						})
					.Get());
			}
			return S_OK;
		})
	.Get(),
			&m_webResourceResponseReceivedToken);

Also tried to capture the content using ContentLoading Event, If I replace the content, unable to get the original value

// Register a handler for the ContentLoading event.
m_webView->add_ContentLoading(
	Callback<ICoreWebView2ContentLoadingEventHandler >(
		[](ICoreWebView2* sender,
			ICoreWebView2ContentLoadingEventArgs* args) -> HRESULT
		{
			wil::unique_cotaskmem_string uri;
			sender->get_Source(&uri);
			std::wstring source(uri.get());
			LOG_INFO_FMT(L"Loading content for %s", source.c_str());

			if (source.compare(L"www.example.com") == 0)
			{

			   //how to stop content loading and provide custom output
				// Stop the current content from loading
				sender->Stop();

				sender->NavigateToString(L"<html><body><h1>Custom Content</h1><p>This is custom content in place of the original.</p></body></html>");
			}
			
			return S_OK;
		}).Get(), &token);

So, is there any other ways to intercept and modify the response before it is rendered in the webview window?

[jls28]

I think it is not possible to read and modify content/response.

you can read/get the content and response in the WebResourceResponseReceived event,
(no put_Content is available here),

you can write the content and response you wish in the WebResourceRequested event,
(get_Content return null while you not use put_Content),

but I see no way to to read and modify.