Rack::Lint - Content-Length is nil in Passenger

Rack::Lint - Content-Length is nil in Passenger

[Joe Fiorini]

I'm at the starting phase of building a web app using Rack. I'm trying
to add in some useful middleware on top of the Lobster demo. I want to
ensure my app always matches the spec, so I'm using Rack::Lint.
However, this immediately bombs out telling me the Content-Length is
nil. My config.ru looks like this:

require 'rack'
require 'rack/lobster'

use Rack::ShowExceptions
use Rack::CommonLogger
use Rack::ShowStatus
use Rack::Lint
use Rack::ContentLength
run Rack::Lobster.new


But even if I take it down to this:

require 'rack'
require 'rack/lobster'

use Rack::Lint
use Rack::ContentLength
run Rack::Lobster.new

it still breaks! I'm running the app on Passenger. It does work,
however, if I run straight through the rackup executable. Perhaps
Passenger is mangling my env hash? If I take out Rack::Lint and run it
(via Passenger), the headers do show a valid Content-Length. Weird,
eh?

Perplexed,
Joe

Re: Rack::Lint - Content-Length is nil in Passenger

[Magnus Holm]

Try putting the ContentLength-middleware above Lint.

2009/6/29, Joe Fiorini <joe@faithfulgeek.org>:
>
> I'm at the starting phase of building a web app using Rack. I'm trying
> to add in some useful middleware on top of the Lobster demo. I want to
> ensure my app always matches the spec, so I'm using Rack::Lint.
> However, this immediately bombs out telling me the Content-Length is
> nil. My config.ru looks like this:
>
> require 'rack'
> require 'rack/lobster'
>
> use Rack::ShowExceptions
> use Rack::CommonLogger
> use Rack::ShowStatus
> use Rack::Lint
> use Rack::ContentLength
> run Rack::Lobster.new
>
>
> But even if I take it down to this:
>
> require 'rack'
> require 'rack/lobster'
>
> use Rack::Lint
> use Rack::ContentLength
> run Rack::Lobster.new
>
> it still breaks! I'm running the app on Passenger. It does work,
> however, if I run straight through the rackup executable. Perhaps
> Passenger is mangling my env hash? If I take out Rack::Lint and run it
> (via Passenger), the headers do show a valid Content-Length. Weird,
> eh?
>
> Perplexed,
> Joe
>


-- 

//Magnus Holm

Re: Rack::Lint - Content-Length is nil in Passenger

[Yehuda Katz]

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According to the spec, Content-Length is *not* required. It is only required
to be correct if it is present. Part of the reason for this is that
repeatedly calculating Content-Length is quite expensive compared to a
single outbound server (like Passenger itself) calculating it before sending
it on.
-- Yehuda

On Sun, Jun 28, 2009 at 5:56 PM, Joe Fiorini <joe@faithfulgeek.org> wrote:

>
> I'm at the starting phase of building a web app using Rack. I'm trying
> to add in some useful middleware on top of the Lobster demo. I want to
> ensure my app always matches the spec, so I'm using Rack::Lint.
> However, this immediately bombs out telling me the Content-Length is
> nil. My config.ru looks like this:
>
> require 'rack'
> require 'rack/lobster'
>
> use Rack::ShowExceptions
> use Rack::CommonLogger
> use Rack::ShowStatus
> use Rack::Lint
> use Rack::ContentLength
> run Rack::Lobster.new
>
>
> But even if I take it down to this:
>
> require 'rack'
> require 'rack/lobster'
>
> use Rack::Lint
> use Rack::ContentLength
> run Rack::Lobster.new
>
> it still breaks! I'm running the app on Passenger. It does work,
> however, if I run straight through the rackup executable. Perhaps
> Passenger is mangling my env hash? If I take out Rack::Lint and run it
> (via Passenger), the headers do show a valid Content-Length. Weird,
> eh?
>
> Perplexed,
> Joe
>



-- 
Yehuda Katz
Developer | Engine Yard
(ph) 718.877.1325

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Re: Rack::Lint - Content-Length is nil in Passenger

[Hongli Lai]

On Jun 29, 2:56 am, Joe Fiorini <j...@faithfulgeek.org> wrote:
> I'm at the starting phase of building a web app using Rack. I'm trying
> to add in some useful middleware on top of the Lobster demo. I want to
> ensure my app always matches the spec, so I'm using Rack::Lint.
> However, this immediately bombs out telling me the Content-Length is
> nil. My config.ru looks like this:
>
> require 'rack'
> require 'rack/lobster'
>
> use Rack::ShowExceptions
> use Rack::CommonLogger
> use Rack::ShowStatus
> use Rack::Lint
> use Rack::ContentLength
> run Rack::Lobster.new
>
> But even if I take it down to this:
>
> require 'rack'
> require 'rack/lobster'
>
> use Rack::Lint
> use Rack::ContentLength
> run Rack::Lobster.new
>
> it still breaks! I'm running the app on Passenger. It does work,
> however, if I run straight through the rackup executable. Perhaps
> Passenger is mangling my env hash? If I take out Rack::Lint and run it
> (via Passenger), the headers do show a valid Content-Length. Weird,
> eh?

Are you using 2.2.3 or later? Several Rack compliance bugs have been
fixed in 2.2.3.