parse_headers.rb

header_str = %{OK
Date: Tue, 07 Feb 2012 22:22:07 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=bab1543250b91b27:FF=0:TM=1328653327:LM=1328653327:S=K3aQc6lscb42U2hG; expires=Thu, 06-Feb-2014 22:22:07 GMT; path=/; domain=.google.com
Set-Cookie: NID=56=chSUHRqwS4ZVjTWYsUitM7la_WatmdW7Oke3DNqIWJE1s8AMl4QxEr2MSnklJPuRdPM6yrmTm7m-MB5cgEZn0yU1ntDSgWn2VMksu4iK3AvMpkqwMu9vOGXCiuawyTDr; expires=Wed, 08-Aug-2
012 22:22:07 GMT; path=/; domain=.google.com; HttpOnly                                                                                                                    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."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Transfer-Encoding: chunked}

headers = {}
header_str.split("\n").each do |h|
  k, v = h.split(': ')
  headers[k] << v rescue headers[k] = [v] if v
end