diff --git a/lib/puppet/network/http/rack/rest.rb b/lib/puppet/network/http/rack/rest.rb
index e5f50c465..b7e1d9709 100644
--- a/lib/puppet/network/http/rack/rest.rb
+++ b/lib/puppet/network/http/rack/rest.rb
@@ -1,102 +1,102 @@
 require 'puppet/network/http/handler'
 require 'puppet/network/http/rack/httphandler'
 
 class Puppet::Network::HTTP::RackREST < Puppet::Network::HTTP::RackHttpHandler
 
   include Puppet::Network::HTTP::Handler
 
   HEADER_ACCEPT = 'HTTP_ACCEPT'.freeze
   ContentType = 'Content-Type'.freeze
 
   CHUNK_SIZE = 8192
 
   class RackFile
     def initialize(file)
       @file = file
     end
 
     def each
       while chunk = @file.read(CHUNK_SIZE)
         yield chunk
       end
     end
 
     def close
       @file.close
     end
   end
 
   def initialize(args={})
     super()
     initialize_for_puppet(args)
   end
 
   def set_content_type(response, format)
     response[ContentType] = format_to_mime(format)
   end
 
   # produce the body of the response
   def set_response(response, result, status = 200)
     response.status = status
     unless result.is_a?(File)
       response.write result
     else
-      response["Content-Length"] = result.stat.size
+      response["Content-Length"] = result.stat.size.to_s
       response.body = RackFile.new(result)
     end
   end
 
   # Retrieve the accept header from the http request.
   def accept_header(request)
     request.env[HEADER_ACCEPT]
   end
 
   # Retrieve the accept header from the http request.
   def content_type_header(request)
     request.content_type
   end
 
   # Return which HTTP verb was used in this request.
   def http_method(request)
     request.request_method
   end
 
   # Return the query params for this request.
   def params(request)
     result = decode_params(request.params)
     result.merge(extract_client_info(request))
   end
 
   # what path was requested? (this is, without any query parameters)
   def path(request)
     request.path
   end
 
   # return the request body
   # request.body has some limitiations, so we need to concat it back
   # into a regular string, which is something puppet can use.
   def body(request)
     body = ''
     request.body.each { |part| body += part }
     body
   end
 
   def extract_client_info(request)
     result = {}
     result[:ip] = request.ip
 
     # if we find SSL info in the headers, use them to get a hostname.
     # try this with :ssl_client_header, which defaults should work for
     # Apache with StdEnvVars.
     if dn = request.env[Puppet[:ssl_client_header]] and dn_matchdata = dn.match(/^.*?CN\s*=\s*(.*)/)
       result[:node] = dn_matchdata[1].to_str
       result[:authenticated] = (request.env[Puppet[:ssl_client_verify_header]] == 'SUCCESS')
     else
       result[:node] = resolve_node(result)
       result[:authenticated] = false
     end
 
     result
   end
 
 end