之前提到用 HTTP 中转的办法解决了评论的问题,今天发现 Blog 上所有的评论又失效了…… 开始以为是因为页面直接引用了 www.blogger.com 域名的某些内容而导致撞墙,但仔细分析后发现,我的 HTTP 中转直接不能访问了,而且之后我的 HTTP 中转程序所在的域名也会在一小段时间内无法访问…… 但同时,用该中转能够访问原本没有被封的内容,比如 Flickr……
考虑到传入的目标 URL 参数是用 Base64 和 URL Encode 方式处理的,不存在任何加密,而且这和大多数的 WEB 代理相同,所以推测是现在 GFW 能够识别用 Base64 编码的内容,如果该内容刚好是被屏蔽的网址,则阻拦该 HTTP 请求,并且屏蔽该请求所在的域…… 从而让公众无法通过 WEB 代理访问屏蔽内容。
当然,解决的办法也简单,如果不能简单通过 Base64 decode 得到一个 URL,那么它也就无从判断是不是被屏蔽的网址了……
我起先想直接把原网址按位取反再 Base64 就行了,结果同事说我作为一个 IT 人士这么干太低级了…… 他们说用 RSA 吧,但是也犯不着这么兴师动众吧……
还是 Liuming 小弟比较聪明,提供了一个比按位取反高级,又比 RSA 简单的办法,那就是……
两次 Base64…… >.<"e;
29 comments:
测试留言~
万恶的GFW
和我的想法一样,两次base64
两次 Base64…… 真强大
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