From: Alex Young <alex@...>
Date: 2006-08-17T17:20:57+09:00
Subject: Re: Test For JPEG Image Over HTTP

Neil Charlton wrote:
> Hi
> 
> I would like to test for the existence of a .jpg image on a remote 
> server over HTTP.
> 
> I have tried 2 different methods but they are not what I need.
> 
> Method 1:
> 
> require 'open-uri'
> if open('http://example.net/path/to/image.jpg')
> 
> end
> 
require 'net/http'

# Strict existence
def url_exists?(path)
   u  = URI.parse(path)
   h = Net::HTTP.new(u.host, u.port)
   r = h.head(u.path)
   return Net::HTTPOK === r
end

# Lack of non-existence
def url_found?(path)
   u  = URI.parse(path)
   h = Net::HTTP.new(u.host, u.port)
   r = h.head(u.path)
   return !(Net::HTTPNotFound === r)
end

-- 
Alex