Sinatra stream(:keep_open) not holding connections open

Eric Wong normalperson at
Wed Dec 5 03:18:48 UTC 2012

"W. Andrew Loe III" <andrew at> wrote:
> I've pushed a very very stripped down example that just echos the time.

Thanks for the test case, I've just pushed out the following fix
to "master" of git://

I've pushed a rainbows prerelease to
It should be installable with: gem install --pre rainbows

I expect this to work for you, but be sure to let me know if it doesn't :x

Since this is a pretty small fix, I think I'll push 4.4.2 final
very soon.

>From d5c8cc8b51619f0d33f75036c53e3936ad2749b2 Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson at>
Date: Wed, 5 Dec 2012 03:08:19 +0000
Subject: [PATCH] event_machine: properly defer body.close for async

Calling body.close in the normal write_response() code path
is incorrect, and only worked out of sheer luck with
Cramp and async_sinata.

This change allows stream(:keep_open) in Sinatra to work

Thanks to W. Andrew Loe III for the informative bug report
and reproducible test case.

 lib/rainbows/event_machine/client.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/rainbows/event_machine/client.rb b/lib/rainbows/event_machine/client.rb
index e56931f..fc0dfe3 100644
--- a/lib/rainbows/event_machine/client.rb
+++ b/lib/rainbows/event_machine/client.rb
@@ -64,8 +64,11 @@ class Rainbows::EventMachine::Client < EM::Connection
     @state = :headers if alive
     if body.respond_to?(:errback) && body.respond_to?(:callback)
       @deferred = body
+      write_headers(status, headers, alive)
+      write_body_each(body)
       deferred_callback(body, alive)
+      return
     elsif body.respond_to?(:to_path)
       st = File.stat(path = body.to_path)
Eric Wong

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