RFC (Request for Comments)

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rfc
Examples: 
rfc 1945
Open RFC 1945
rfc http
Open RFC about HTTP
URL: 
https://www.google.com/search?hl={$language}&ie=utf-8&btnI=1&q=site%3Awww.ietf.org%2Frfc%2F%20{%query} http://rfc{%query}.txt