From: Shea Martin <shea@...>
Date: 2007-08-03T03:35:03+09:00
Subject: Re: net::http and caching files

I have just tried about 20 servers (random urls), and have not seen and 
etag or last_modified on any of them.  Is there really that few of 
servers which support the two?

Am I doing something wrong?

I am on win32 if it matters.

CODE:
require 'open-uri'

# h = {}
# h['If-Modified-Since'] = 'Thu, 09 Aug 2007 17:33:40 GMT'
http = Net::HTTP.new( "www.google.com" )
resp, data = http.get( "/index.html" )
p "r is #{resp}"
p "code is #{resp.code}"
resp.each { |k,v| p "#{k} = #{v}" }

#open( "http://google.ca" ) do |f|
#	p f.last_modified
#end

exit 0


~S


Lionel Bouton wrote:
> 
>>
>> Just read what 'etag' is.  Do I actually need mtime, if I have etag?
> 
> Depends on the server on the other side. Both have roughly the same 
> usage ('last_modified' can't be reliably parsed as an accurate date as 
> there are servers with inaccurate clocks or bad timezone settings) but 
> anyone of them can be used at the server's discretion. If you don't know 
> in advance which server you'll fetch information from and which header 
> it will respond with, better implement support bor both.
> 
> Lionel
>