Display HTTP headers using Open::URI?
Use the meta method of the virtual filehandle:
open('http://google.com'){|f| pp f.meta }{"x-frame-options"=>"SAMEORIGIN", "expires"=>"-1", "p3p"=> "CP=\"This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info.\"", "content-type"=>"text/html; charset=ISO-8859-1", "date"=>"Mon, 17 Dec 2012 14:37:29 GMT", "server"=>"gws", "x-xss-protection"=>"1; mode=block", "set-cookie"=> "PREF=ID=d2fb8a93d369bcd2:FF=0:TM=1355755049:LM=1355755049:S=ONVSP6n2jtluFgll; expires=Wed, 17-Dec-2014 14:37:29 GMT; path=/; domain=.google.com, NID=67=OFEvvHCOa3C6wScQCUIKfu_89oL9MSmnFjwN-u5LX_foP8NLsX7G9dq48NLVrf4WUXhqOA1jb38s0e9qeRp1Iwx_LT_N8IuF0Qi6dXVtR2zdvA86INqtfg5uNrKvxJfJ; expires=Tue, 18-Jun-2013 14:37:29 GMT; path=/; domain=.google.com; HttpOnly", "cache-control"=>"private, max-age=0", "transfer-encoding"=>"chunked"}http://www.ruby-doc.org/stdlib-1.9.3/libdoc/open-uri/rdoc/OpenURI/Meta.html