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This trick is handy to break DPI systems or firewalls (Like China's). I remember few years ago I connect to youtube directly in China using a python http proxy
by est 14y ago
This trick is handy to break DPI systems or firewalls (Like China's).
I remember few years ago I connect to youtube directly in China using a python http proxy by replacing spaces to \t in http request headers. The GFW let the request pass.
- peterwwillis 14y agoAnother neat trick: linefeed instead of CRLF. Some access control software that major mobile carriers use to captive-portal their data traffic only match on HTTP requests that use CRLF. If the same HTTP traffic uses linefeeds, it's not matched by the ACLs. A simple HTTP proxy that does s/\r\n$/\n/g would allow one to surf for free, even if their bill hasn't been paid in months. Boy, that HTTP standard sure is handy :D