I have a small Mongrel webserver that sends the stdout of a process to a http response:

response.start(200) do |head,out|
  head["Content-Type"] = "text/html"
  status = POpen4::popen4(command) do |stdout, stderr, stdin, pid|
    stdin.close()
    FileUtils.copy_stream(stdout, out)
    FileUtils.copy_stream(stderr, out)
    puts "Sent response."
  end
end

This works well most of the time, but sometimes characters get duplicated. For example this is what I get from the "man ls" command:

LS(1)                            User Commands                           LS(1)



NNAAMMEE
       ls - list directory contents

SSYYNNOOPPSSIISS
       llss [_O_P_T_I_O_N]... [_F_I_L_E]...

DDEESSCCRRIIPPTTIIOONN
       List  information  about  the FILEs (the current directory by default).
       Sort entries alphabetically if none of --ccffttuuvvSSUUXX nor ----ssoorrtt.

       Mandatory arguments to long options are  mandatory  for  short  options

For some mysterious reason capital letters get duplicated. Can anyone explain what's going on?