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How to check what class implements specified method in Ruby?
require 'net/http'
req = Net::HTTP::Get.new( "http://localhost:8080/" )
req.basic_auth( "user", "password" )

req.method(:basic_auth).owner
# => Net::HTTPHeader

Kernel.instance_method(:method).bind(req).(:basic_auth).owner
# => Net::HTTPHeader

class Object
  def which method
    self.class.ancestors.find { |a| a.instance_methods(false).include? method.to_s }
  end
end

puts req.which :basic_auth    #=> Net::HTTPHeader