From: Tony De <tonydema@...>
Date: 2008-04-04T17:06:04+09:00
Subject: Re: Responding to AJAX - XMLHttpRequest

Tony De wrote:
> Matt Todd wrote:
>> One thing to note is that it is expecting a Content-Type of
>> application/json as well as the content to be in actual JSON format.
>> You can simply require 'json' and call wts.to_json which should be
>> sufficient for your needs.
>> 
>> You might consider looking at Rack for building your tiny web app and
>> just proxy some address to it; it really cleans up handling requests
>> and not needing CGI, but your solution does work fine and avoids a
>> problem with AJAX requests failing due to cross-server requests (which
>> is what requests not on port 80 are considered).
>> 
>> Matt Todd
> 
> Hey Matt,
> 
> Thanks for the awesome quick reply.  I'll dig into that.  That's the 
> first I heard of this from any blog or forum.  But there's some sense to 
> what you say.  I've got to get ruby_json on my freebsd server.  I'll let 
> you know how it goes.  Thanks!
> 
> tonyd

Ok,  got json installed.  Making some changes, I still get just the one 
reponse.  It is, however, passing additional data...
Before: ..data..
Now: "...data..."\n

Firebug Header info: (Maybe useful for you to help me troubleshoot)

Response Headers
Date  Fri, 04 Apr 2008 07:46:24 GMT
Server  Apache/2.2.0 (FreeBSD) mod_ssl/2.2.0 OpenSSL/0.9.7e-p1 DAV/2 
mod_perl/2.0.2 Perl/v5.8.8
Content-Length  159
Keep-Alive  timeout=5, max=100
Connection  Keep-Alive
Content-Type  text/html

Request Headers
Host  www.myserver.net
User-Agent  Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) 
Gecko/20080201 Firefox/2.0.0.12
Accept  text/javascript, text/html, application/xml, text/xml, */*
Accept-Language  en-us
Accept-Encoding  gzip,deflate
Accept-Charset  ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive  300
Connection  keep-alive
X-Requested-With  XMLHttpRequest
X-Prototype-Version  1.6.0.2
Referer  http://www.myserver.net/searchlog.html
Authorization  Basic dGVjaDp0M2No

searchlog.rb
---------------------
#!/usr/local/bin/ruby -w
require 'rubygems'
require 'json'
require 'cgi'

@cgi = CGI.new

# Our search params passed from our HTML page
sstring  = @cgi['search']
slogtype = @cgi['logtype']
smethod  = @cgi['method']

# A hash of possible logs
logs = {'smtp' => 'smtp', 'mail' => 'mails', 'mx' => 'mx', 'spam' =>
'spam', 'Dial Up' => 'radius', 'DHCP' => 'dhcp' }

# Send Response
def send_response(wts)
  @cgi.out{ wts.to_json }
end

...
...
# Search through the log
@cgi.header { "Content-Type: application/json" } # Send only the one 
header back (made no diff to include with each response)
File.open("/var/log/#{logs[slogtype]}", 
'r').grep(/#{search_string}/).each do |line|
  send_response( "#{line}<br>" ) # send response for each result
end
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