Re: CommonLogger (and Clogger) generates strange symbols in the response body

["Iñaki Baz Castillo" <ibc@aliax.net>]

El Viernes, 4 de Septiembre de 2009, Iñaki Baz Castillo escribió:
> Hi, I can't understand why the following issue occurs in the response body
> when using CommonLogger:
> 
> 
> ----- app_logic.rb -----
> class AppLogic
>   def call(env)
>     200, {"Content-Type" => "text/plain"}, "line1\nline2\nline3\n"
>   end
> end
> ------------------------
> 
> 
> ------- run_server.rb ------
> require "app_logic.rb"
> rack_inner_app = AppLogic.new
> 
> rack_app = Rack::Builder.new {
>   use Rack::CommonLogger, $stderr
>   run rack_inner_app
> }.to_app
> 
> Rack::Handler::Thin.run rack_app
> ----------------------------
> 
> 
> 
> The reply I get in the 200 OK response is as follows:
> 
> -------------
> HTTP/1.1 200 OK
> Transfer-Encoding: chunked
> Content-Type: text/plain
> Server: OpenXDMS
> Connection: close
> 
> 6
> line1
> 
> 6
> line2
> 
> 6
> line3
> 
> 0
> 
> -------------
> 
> As you can see, the number above each real body line is the length of the
>  line below it (in hexadecimal when > 10).
> 
> 
> If I comment the CommonLogger line, then I get the correct body:
> 
> --------------
> line1
> line2
> line3
> --------------
> 
> 
> 
> It occurs the same if I log to a file and also if I use Clogger instead of
> CommonLogger.
> 
> Is there something wrong in my code? is it the expected behaviour? (I
>  cannot figure it of course as it breaks the response).

It's not an error in my code as a simpler example also issues this problem:

-----simple_rack.rb--------
require 'rubygems'
require 'rack'

infinity = Proc.new {|env| [200, {"Content-Type" => "text/html"}, "hello"]}
builder = Rack::Builder.new do
  use Rack::CommonLogger
  run infinity
end
Rack::Handler::Mongrel.run builder, :Port => 9292
---------------------------

~# ruby1.8 simple_rack.rb


And this is the response:

---------------------------
HTTP/1.1 200 OK
Connection: close
Date: Thu, 03 Sep 2009 23:24:39 GMT
Transfer-Encoding: chunked
Content-Type: text/html

4
hello
0

---------------------------


Without the CommonLogger middleware, the response body is correct:

----------
hello
----------



¿?¿?

-- 
Iñaki Baz Castillo <ibc@aliax.net>