RSS reader protocol

I am now doing an RSS reader research work on the iPad, and found several related reader, such as The Early Edition, News Rack, Pulse News Reader, Mobile RSS HD, Feeddler RSS Reader and Reeder for iPad. Which heroes know that these readers used communication protocol ah, what ftp or http, what information sent to my mailbox fyy604175232@126.com, thank you ah
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HTTP
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Can ah detailed and specific points are used http agreement? Thank you, ah

cited a floor ultrapro reply:

HTTP

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Can you detail specifically under ah, you are using the http protocol? Thank you, ah? Because I now do research, to check these data in great detail, but little information online, I did not find, can not specifically say ah?
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Can not say that the detailed and specific points, ah, what information does not? Because I am now doing research work, these data to be investigated in great detail, but it is not much useful information online, I'm not going to see, so I say more troublesome point with ah, thank you ah!
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I would also like to know, looks like using http