From: Alex Young <alex@...>
Date: 2006-08-17T21:16:41+09:00
Subject: Re: Newbie - Test For JPEG Image Over HTTP

Neil Charlton wrote:
> Alex Young wrote:
>> Neil Charlton wrote:
>>> if open('http://example.net/path/to/image.jpg')
>>> The server where the images are always returns a default page if the 
>>> images do not exist so the code above always returns.
>>>
>>> What I need is a way to check what is returned is not a html page but is 
>>> a .jpg image.
>>>
>> Oh.  Try this:
>>
>> require 'net/http'
>>
>> def url_is_a_jpg(url)
>>    u = URI.parse(url)
>>    h = Net::HTTP.new(u.host, u.port)
>>    r = h.head(u.path)
>>    return r.content_type == 'image/jpeg'
>> end
> 
> Hi Alex
> 
> Thanks for your help. I can see what you are doing there unfortunately I 
> get the following error
> 
> isjpg.rb:7:in `url_is_a_jpg': undefined method `content_type' for 
> #<Net::HTTPOK 200 readbody=true> (NoMethodError)
> 
> ruby -v is
> ruby 1.8.2 (2004-12-25) [x86_64-linux]
> 
> Any ideas ?
Is that for a path that does exist, doesn't exist, or both?

-- 
Alex