meta -> Hash[permalink][rdoc][edit]-
ヘッダを収録したハッシュを返します。
例require 'open-uri' URI.open('http://example.com/') {|f| p f.meta # => {"date" => "Sun, 04 May 2008 11:26:40 GMT", # "content-type" => "text/html;charset=utf-8", # "server" => "Apache/2.0.54 (Debian GNU/Linux) mod_ssl/2.0.54 OpenSSL/0.9.7e", # "transfer-encoding" => "chunked"} }