PyQt/PySide2 QWebEngineView遇到No 'Access-Control-Allow-Origin' header 错误解决

注：如果不是和pyqt/PySide2直接相关程序，请查阅其他解决方案。
问题描述：
1.环境：PySide2, Python3.6.8，arcgis JavaScript API 4.14。
2.现象：新建HTML和js文件，通过arcgis JavaScript API 调用basemap。直接用浏览器打开HTML，运行正常，但是通过PySide2的QWebEngineView调用时，会报出如下错误：

*** has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’
header is present on the requested resource. If an opaque response
serves your needs, set the request’s mode to ‘no-cors’ to fetch the
resource with CORS disabled.

3.解决方法：在实例化

self.browser=QWebEngineView()

之后，需要调用：