使用Open :: URI顯示HTTP標頭？

Question

與開放：URI，我可以做到以下幾點：

require 'open-uri' 
#check status 
open('http://google.com').status 
#get entire html 
open('http://google.com').read 

是否有可能得到一個請求的HTTP頭這樣的事情可以調試，像捲髮curl -I http://google.com？

$ curl -I google.com 
HTTP/1.1 301 Moved Permanently 
Location: http://www.google.com/ 
Content-Type: text/html; charset=UTF-8 
Date: Mon, 17 Dec 2012 14:28:17 GMT 
Expires: Wed, 16 Jan 2013 14:28:17 GMT 
Cache-Control: public, max-age=2592000 
Server: gws 
Content-Length: 219 
X-XSS-Protection: 1; mode=block 
X-Frame-Options: SAMEORIGIN 

這可能嗎？

Answer 1

使用虛擬文件句柄的meta方法：

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