This URL should be the same as the canvas callback URL you entered earlier.
此 URL 应该与您较早输入的画布回调 URL 相同。
The callback URL is set to this servlet's context as it was defined in web.xml.
这个回调url会被保存在这个Servlet的上下文中，就像它在web . xml定义一样。
And by default, callback URL is configured in web.xml which points to localhost.
默认情况下，在指向localhost的web . xml中配置回调url。
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