showheaders.rb

require 'restclient'
require 'pp'
require 'hpricot'

if ARGV.size == 0
  puts "Usage: showheaders.rb <url> [headers]"
  puts
  puts "  Headers are optional, but should come in as pairs of arguments."
  puts "    showheaders.rb <url> If-None-Match 4eb6dc"
  exit 1
end

url = ARGV[0]
headers = {}
(1..ARGV.size-1).step(2) do |i|
  headers[ARGV[i]] = ARGV[i+1]
end

response = nil
begin
  response = RestClient.get url, headers
rescue RestClient::ExceptionWithResponse => e
  response = e.response
  def response.headers
    RestClient::Response.beautify_headers(self.to_hash)
  end
end

puts response.code
pp response.headers
pp Hpricot(response.to_s)