From 447eb192355ee3979f288c84c819af1de3266200 Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@gmail.com>
Date: Wed, 11 Jan 2023 17:18:22 +0100
Subject: [PATCH] Fix Rack::Lint error message for HTTP_CONTENT_TYPE and
 HTTP_CONTENT_LENGTH

Currently it's printing:

```
Rack::Lint::LintError: env contains HTTP_CONTENT_TYPE, must use
```

Which had me puzzled for quite a while.
---
 lib/rack/lint.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/rack/lint.rb b/lib/rack/lint.rb
index ed3c7f421..ee3ec7161 100644
--- a/lib/rack/lint.rb
+++ b/lib/rack/lint.rb
@@ -303,7 +303,7 @@ def check_environment(env)
         ## (use the versions without <tt>HTTP_</tt>).
         %w[HTTP_CONTENT_TYPE HTTP_CONTENT_LENGTH].each { |header|
           if env.include? header
-            raise LintError, "env contains #{header}, must use #{header[5, -1]}"
+            raise LintError, "env contains #{header}, must use #{header[5..-1]}"
           end
         }