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See the TMiniBrowserFrm.WVBrowser1WebResourceResponseReceived procedure :
https://github.com/salvadordf/WebView4Delphi/blob/c58854a5441ab766b6ff2c60ff0a246bb3d6d59f/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L858
And the TMiniBrowserFrm.WVBrowser1WebResourceResponseViewGetContentCompleted procedure :
https://github.com/salvadordf/WebView4Delphi/blob/c58854a5441ab766b6ff2c60ff0a246bb3d6d59f/demos/Delphi_VCL/MiniBrowser/uMiniBrowser.pas#L900C11-L900C79
You can check the URI of the resource request like I commented previously :
https://www.briskbard.com/forum/viewtopic.php?p=8883#p8883
The call TempResponse.GetContent(TempHandler); if that's the URI you want and the TWVBrowserBase.OnWebResourceResponseViewGetContentCompleted event will be triggered. Read the code comments in MiniBrowser.