module HTTParty::ClassMethods

def http_proxy(addr = nil, port = nil, user = nil, pass = nil)

end
http_proxy 'http://foo.com', 80, 'user', 'pass'
include HTTParty
class Foo

Allows setting http proxy information to be used 
def http_proxy(addr = nil, port = nil, user = nil, pass = nil)
  default_options[:http_proxyaddr] = addr
  default_options[:http_proxyport] = port
  default_options[:http_proxyuser] = user
  default_options[:http_proxypass] = pass
end