From: Diego Guillen <ruby.facil@...>
Date: 2009-05-22T09:08:14+09:00
Subject: Re: Webrick problem, PREMATURE END OF SCRIPT HEADERS

Hi, I think the problem is that webrick doesn't know how to execute the 
"shebang" line found in cgi scripts on Windows (in Linux it's not a 
problem).

I found the same problem more recently with Ruby 1.9.1 on Windows.

A generic solution that works for both Ruby 1.8.6.pxxx and 1.9.1.p0 on 
Windows is the following:

Edit the file: c:\ruby\lib\ruby\1.8\webrick\httpservlet\cgi_runner.rb

Add the following lines at the top of the file:

if "1.9.1" == RUBY_VERSION
  require 'rbconfig'  #constants telling where Ruby runs from
end

Now, locate the last line where is says:  exec ENV["SCRIPT_FILENAME"]
Comment that line out and add the following code:

# --- from here ---
if "1.9.1" == RUBY_VERSION  #use RbConfig
  Ruby = File::join(RbConfig::CONFIG['bindir'],
                        RbConfig::CONFIG['ruby_install_name'])
  Ruby << RbConfig::CONFIG['EXEEXT']
else                        # use ::Config
  Ruby = File::join(::Config::CONFIG['bindir'],
                        ::Config::CONFIG['ruby_install_name'])
  Ruby << ::Config::CONFIG['EXEEXT']
end

if /mswin|bccwin|mingw/ =~ RUBY_PLATFORM
  exec "#{Ruby}", ENV["SCRIPT_FILENAME"]
else
  exec ENV["SCRIPT_FILENAME"]
end
# --- to here ---

Save the file and restart the webrick server.

Explanation:
This code just builds a constant 'Ruby' with the full path to 
"ruby.exe", and
(if you're running on Windows) it passes the additional parameter
"c:\ruby\bin\ruby.exe" , to the Kernel.exec() method, so that your 
script can be executed.


-- 
Posted via http://www.ruby-forum.com/.