From: Michael Schilling <ruby@...>
Date: 2006-02-09T05:35:28+09:00
Subject: can't get multipart_form from cgi.rb to work

Hello everyone,

I'm fairly new to ruby and wanted to write a very simple cgi program,
which uploads a file and returns a converted file. Because it is so easy
(and I want to learn about ruby) I tried to do it with the standard
cgi.rb library. But I can't get the multipart_form (I need it for the
file upload) to work right. Everything works fine using the normal form
method, but with the multipart_form I always get an EOF Error 'no
content body' in the apache log. As soon as there is any input from an
multipart_form, an error occurs at: checkfile = CGI.new

Below you'll find my code (I boiled it down to the important stuff) and the
corresponding part of my apache2 error_log. I searched the web, several
mailing lists and the ruby docs, but couldn't find an answer. I also
asked on #ruby-lang in freenode, but no one there knew the cgi.rb
library very well.

Any help, on why this server error is happening, is very much
appreciated. 

Bye, 
     Michael <-- who hopes, that this is the right list for the question



My code:
------------------------------------------------------------------
#!/usr/bin/ruby -w

require "cgi"

# make_form create a very simple html form
def make_form
  make_form = CGI.new("html4")
  make_form.out {
    make_form.html {
      make_form.body { "\n" +
#        make_form.form{ "\n" +    # everything works using the normal form
        make_form.multipart_form{ "\n" +    # but not with multipart_form to upload a file
        make_form.file_field("filename",40,500000) + "\n" +
        make_form.br +
        make_form.submit("test it") + "\n"
        }
      }
    }
  }
end

# answer should show the filename of the uploaded file
def answer(file_in)

  answer = CGI.new("html4")
  answer.out {
    answer.html {
      answer.body{ "\n" +
      answer.p{ "This should be the filename:" + file_in + "\n" } +
      answer.br
      }
    }
  }
end



begin
  checkfile = CGI.new
  parameter = checkfile['filename']
#  parameter = checkfile.params['filename'][0]  # this doesn't work either

rescue
  answer("ERROR: " + $!.to_s) # send eror message to browser if possible
end


# create form if no data was send to the script, otherwise answer
if parameter == ""
  make_form()
else
  answer(parameter.to_s)
end
------------------------------------------------------------------


Apache log:
------------------------------------------------------------------
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] /usr/lib/ruby/1.8/cgi.rb:979:in `read_multipart', referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] : , referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] no content body, referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1]  (, referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] EOFError, referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] ), referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] \tfrom /usr/lib/ruby/1.8/cgi.rb:1104:in `initialize_query', referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] \tfrom /usr/lib/ruby/1.8/cgi.rb:2270:in `initialize', referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] \tfrom /home/httpd/cgi-bin/multiform-test.rb:25:in `answer', referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] \tfrom /home/httpd/cgi-bin/multiform-test.rb:52, referer: http://localhost/cgi-bin/multiform-test.rb
[Wed Feb 08 21:08:57 2006] [error] [client 191.168.1.1] Premature end of script headers: multiform-test.rb, referer: http://localhost/cgi-bin/multiform-test.rb
------------------------------------------------------------------



-- 
Michael Schilling                  

eMail : ruby@untiefe.de
 URL  : http://glcu.sf.net/


"Change my name I remain the same." - Moloko