.htaccess

Options +FollowSymLinks +ExecCGI
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ /dispatch.fcgi/$1 [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},QSA,L]
ErrorDocument 500 "Application error: Ruby Camping application failed to start properly

dispatch.cgi

#!/usr/bin/ruby

Dir.chdir '/path/to/your/camping/app'

require 'rubygems'
require 'rack'
require 'camping'

require 'your_camping_app.rb'

LOGPATH = File.dirname(__FILE__) + '/your_camping_app.log'

logger = Logger.new(LOGPATH)

module Rack
  class Request
    alias :original_rack_POST :POST
    
    def POST
      begin
        original_rack_POST
      rescue Errno::ESPIPE
        @env["rack.request.form_hash"]
      end
    end
    
  end
end

class OneAndOneCGIAdapter
    def initialize(app)
      @app = app
    end
    
    def call(env)
      env['SCRIPT_NAME'] = '/'

      # Assuming your .htaccess has:
      # RewriteRule ^(.*)$ /dispatch.fcgi/$1 [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},QSA,L]
      env['HTTP_AUTHORIZATION'] = env['REDIRECT_REDIRECT_HTTP_AUTHORIZATION'] || ''

      begin
        @app.call(env)	
      rescue Exception => ex
        msg = "<h1>Error: #{$!}</h1>"
        msg << "<p>#{Time.now}</p>"
        msg << '<ol>'
        ex.backtrace.each { | t | msg << "<li>#{t}</li><br/>" }
        msg << '</ol>'
      
        logger = Logger.new(LOGPATH)
        logger.error msg
      
        [200,{"Content-Type" => "text/html"},msg]
      end
    end
end

adapter = OneAndOneCGIAdapter.new(YourCampingApp)

logger.info "start request for #{ENV['SCRIPT_URI']}"
Rack::Handler::CGI.run adapter , :Port => 80