From eec2635065ec0aea425d3d889078b71a034c17b8 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Sat, 8 Feb 2020 00:30:38 +1300
Subject: Allow SERVER_PORT to be a string containing a port number.

---
 lib/rack/lint.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/rack/lint.rb b/lib/rack/lint.rb
index bc5b7f50..16b5feea 100644
--- a/lib/rack/lint.rb
+++ b/lib/rack/lint.rb
@@ -279,10 +279,10 @@ module Rack
         assert("env missing required key #{header}") { env.include? header }
       }
 
-      ## The <tt>SERVER_PORT</tt> must be an integer if set.
-      assert("env[SERVER_PORT] is not an integer") do
+      ## The <tt>SERVER_PORT</tt> must be an Integer if set.
+      assert("env[SERVER_PORT] is not an Integer") do
         server_port = env["SERVER_PORT"]
-        server_port.nil? || server_port.is_a?(Integer)
+        server_port.nil? || (Integer(server_port) rescue false)
       end
 
       ## The <tt>SERVER_NAME</tt> must be a valid authority as defined by RFC7540.
-- 
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