MiddleboxTester

How to run?

1) Disable Wifi and Enable 3/4G, turn on location service as well
2) Select carrier by tapping on phone's menu. Then click play button on the top right
3) It takes about 30 seconds to run until you get a "Done" message. It would be great if you could run a few times.

Thanks,

Updates in this version:
+ interleave http and http requests

It is common for Internet service providers to deploy proxies in their networks for traffic management, performance optimization and security reasons. We know mobile carriers also set up middleboxes in cellular networks. However, the policies of middleboxes in cellular networks are hidden to public. A recent studies show that the transparent proxies in four major US cellular providers and determines their impact on performance. The result of proxy behaviors we can detect include but not limited to Caching, Request Redirection, Content Rewriting, Connection Persistence, Delayed Handshaking.