From: Richard Cole <rcole@...>
Date: 2005-04-07T12:06:15+09:00
Subject: Beginner Question with Net::Proxy

Hi,

I'm trying without success to do an http get via a proxy using net/http 
and I just can't work it out. Got any suggestions where I'm going wrong, 
how the code could be made simpler? Are there any decent docs for the 
library net library?  My non working code follows.

I redefined the InternetMessageIO method connect to see what the 
net/http library  is doing and it isn't using the proxy settings.

regards,

Richard.


-----

require 'net/http'
require 'cgi'

class HttpGetError < Exception
  attr_reader :response
  def initialize(response)
    @response = response
  end
end

module Net

  class InternetMessageIO
   
    def connect( open_timeout )
      puts "LOG: opening connection to #{@address}..."
      timeout(open_timeout) {
        @socket = TCPsocket.new(@address, @port)
      }
      @rbuf = ''
    end
   
  end

end


class PubMed

  attr_reader :proxy_addr, :proxy_port, :proxy

  def initialize
    @einfo = "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/einfo.fcgi"
    @proxy_addr = "proxy"  # this is my local proxy
    @proxy_port = 80
    @proxy = Net::HTTP::Proxy(@proxy_address, @proxy_port)
  end

  def query(base, cgi_args)
    uri = URI.parse(base)
    cgi_arg_list = cgi_args.collect { |h,v| h + "=" + CGI.escape(v) }
    uri.query = cgi_arg_list.join("&")

    puts "Fetching .... " + uri.to_s
    @proxy.start(uri.host, uri.port) { |http|
      resp = @proxy.get(uri.path + "?" + uri.query)
      puts resp.class
      resp = http.get(uri)
      if resp.message == "OK" then
        return resp.data
      else
        raise(HttpGetError.new(response), "Http Get Failed: " + 
response.to_s)
      end
    }
  end

  def databases
    return query(@einfo, {})
  end

end

pubmed = PubMed.new
puts "Databases:"
puts pubmed.databases