lib/instana/instrumentation/rack.rb in instana-1.9.6 vs lib/instana/instrumentation/rack.rb in instana-1.9.7

@@ -22,16 +22,17 @@
       if ENV.key?('INSTANA_SERVICE_NAME')
         kvs[:service] = ENV['INSTANA_SERVICE_NAME']
       end
 
       if ::Instana.agent.extra_headers
-        for custom_header in ::Instana.agent.extra_headers
+        ::Instana.agent.extra_headers.each { |custom_header|
           # Headers are available in this format: HTTP_X_CAPTURE_THIS
-          rack_header = ('HTTP_' + custom_header.upcase).gsub('-', '_')
+          rack_header = 'HTTP_' + custom_header.upcase
+          rack_header.tr!('-', '_')
           if env.key?(rack_header)
             kvs["http.#{custom_header}"] = env[rack_header]
           end
-        end
+        }
       end
 
       # Check incoming context
       incoming_context = {}
       if env.key?('HTTP_X_INSTANA_T')