ext: ensure headers#each in response is valid

We're not Rack::Lint, but we still need to take steps to
avoid segfaulting if we host non-Rack::Lint-compliant
applications.

This also updates the pure variant to fail on bad applications,
too.

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/clogger/pure.rb b/lib/clogger/pure.rb
index f593af0..0a7aa24 100644
--- a/lib/clogger/pure.rb
+++ b/lib/clogger/pure.rb
@@ -133,7 +133,12 @@ private
   end
 
   def get_sent_header(headers, match)
-    headers.each { |key, value| match == key.downcase and return value }
+    headers.each do |pair|
+      Array === pair && pair.size >= 2 or
+        raise TypeError, "headers not returning pairs"
+      key, value = pair
+      match == key.downcase and return value
+    end
     "-"
   end