Change the HttpContext instance if necessary.
如有必要，更改HttpContext实例。
If you are using basic authentication, you must create an HttpContext instance.
如果您使用的是基本认证机制，您必须创建一个HttpContext实例。
Remember to pass in the local HttpContext instance to authenticate with the server
记住将本地HttpContext实例传递给服务器的authenticate
Remember to pass in the local HttpContext instance to authenticate with the server
记住将本地HttpContext实例传递给服务器的authenticate
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