QWebEnginePage::acceptNavigationRequest() was not called for external object

    from PyQt5.QtCore import *
    from PyQt5.QtGui import *
    from PyQt5.QtWidgets import *
    from PyQt5.QtWebEngineWidgets import *
    from PyQt5.QtWebEngineCore import *
    import sys,os
    class WebEngineUrlRequestInterceptor(QWebEngineUrlRequestInterceptor):
        def __init__(self, parent=None):
            super().__init__(parent)
        def interceptRequest(self, info):
            # if info.requestUrl().toString().startswith('http://changyan.itc.cn/mdevp/extensions/first-login-prompt'):
            self.targetUrl = info.requestUrl().toString()
            print('QWebEngineUrlRequestInterceptor----------------------------------------------', self.targetUrl)
    
    class WebEnginePage(QWebEnginePage):  
      def __init__(self, parent=None, mdicts=[]):
        super().__init__(parent)
    
      def acceptNavigationRequest(self, url, navigationType, isMainFrame):  # Navigation requests can be delegated to the Qt application instead of having the HTML handler engine process them by overloading this function. This is necessary when an HTML document is used as part of the user interface, and not to display external data, for example, when displaying a list of results.# The QWebEngineUrlRequestInterceptor class offers further options for intercepting and manipulating requests.
        urlStr = url.toString()
        print('acceptNavigationRequest----------', urlStr)
        return True  # If the function returns true, the navigation request is accepted and url is loaded.
    
    
    class WebEngineView(QWebEngineView):
        def __init__(self, parent=None):
            super().__init__(parent)
            p=WebEnginePage()
            self.setPage(p)
            self.webPage = self.page()  # QWebEnginePage()
            print(p==self.webPage)
            # # self.webPage.settings().setAttribute(QWebEngineSettings.LocalContentCanAccessFileUrls, True)
    
    
            self.webPage.profile().setUrlRequestInterceptor(WebEngineUrlRequestInterceptor(self)) 
            self.webPage.setHtml('<a href="sound://uk/want__gb_1.spx">sound scheme</a><img src="uk_pron.png"/>', baseUrl=QUrl.fromLocalFile(os.getcwd()+os.path.sep))#For external objects to be loaded, baseUrl cannot be empty；os.getcwd()+os.path.sep必须，不加的话没有trailing slash，会让webview用父路径加载资源→出不来
            # self.webPage.setHtml('<a href="sound://uk/want__gb_1.spx">sound scheme</a><img src="uk_pron.png"/>', baseUrl=QUrl('file://1.0.3.1'))
            
    if __name__ == "__main__":
        app = QApplication(sys.argv)
        webEngineView = WebEngineView()
        webEngineView.show()
        sys.exit(app.exec_())