A sample Ruby application showing how to make an HTTP request using TCP Sockets

http.rb

#!/usr/bin/env ruby
# http.rb
# 
# Sample application showing how to create HTTP request using TCP Sockets in Ruby

require 'socket'

class Request
    attr_reader :method, :host, :resource, :client, :lines

    def initialize(method, host, resource = '/index.html' , client = 'http')
        @method, @host, @resource, @client = method, host, resource, client

        prepare_message
    end

private

    def prepare_message
        @lines ||= [
            "#{@method} #{resource} HTTP/1.1\r\n",
            "Host: #{@host}\r\n",
            "User-Agent: #{@client}\r\n",
            "\r\n"
        ]
    end

end

class Response
    REGEXP_HTTP_STATUS_LINE = /HTTP\/1.1 (\d{3}) (.*)/

    attr_reader :lines, :status, :reason, :headers, :body

    def initialize(lines)
        @lines = lines

        extract_status_line
        extract_headers
        extract_body
    end


private

    def extract_status_line
        @lines[0].chop.match(REGEXP_HTTP_STATUS_LINE) do |match|
            @status = match.captures[0]
            @reason = match.captures[1]
        end
    end

    def extract_headers
        sep = @lines.find_index { |line| line == "\r\n" }
        @headers = @lines[0, sep].map { |line| line.chop }
    end

    def extract_body
        sep = @lines.find_index { |line| line == "\r\n" }
        @body = @lines[(sep + 1..-1)]
    end
end

class HTTP
    class << self
        def get(url)
            s = TCPSocket.new url, 80

            req = Request.new :GET, url
            req.lines.each { |line| s.print line }

            lines = []
            while line = s.gets
                lines << line          
            end

            res = Response.new lines

            s.close

            res
        end
    end
end 

ARGV.each do |url|
    response = HTTP.get url

    puts %Q{"#{url}" response with #{response.status} #{response.reason}}
end