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From: Eric Wong <normalperson@yhbt.net>
Newsgroups: gmane.comp.lang.ruby.clogger.general
Subject: [PATCH] README: document $env support for reading Rack env
Date: Thu, 14 Aug 2014 19:46:21 +0000
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This is more portable across different servers than Thread.current
in case of non-blocking servers which may be serving multiple
clients at once.  This is also faster than relying on $e{...} since
$e{...} uses eval and that is slow.
---
 README | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README b/README
index e125b6f..74c8185 100644
--- a/README
+++ b/README
@@ -88,6 +88,7 @@ that receives a "<<" method:
 * $pid - process ID of the current process
 * $e{Thread.current} - Thread processing the request
 * $e{Actor.current} - Actor processing the request (Revactor or Rubinius)
+* $env{variable_name} - any Rack environment variable (e.g. rack.url_scheme)
 
 == REQUIREMENTS
 
-- 
EW