handle failure to upcase invalid strings

Some strings cannot be upper cased and raise an ArgumentError instead.
Let's capture this error and log its occurence to the environment via
rack.errors

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/rack/methodoverride.rb b/lib/rack/methodoverride.rb
index 16bf23cf..61cb27fc 100644
--- a/lib/rack/methodoverride.rb
+++ b/lib/rack/methodoverride.rb
@@ -26,7 +26,11 @@ module Rack
       req = Request.new(env)
       method = method_override_param(req) ||
         env[HTTP_METHOD_OVERRIDE_HEADER]
-      method.to_s.upcase
+      begin
+        method.to_s.upcase
+      rescue ArgumentError
+        env["rack.errors"].puts "Invalid string for method"
+      end
     end
 
     private