diff --git a/example/upgrade_server.rb b/example/upgrade_server.rb
index 75f40c8..35b0576 100644
--- a/example/upgrade_server.rb
+++ b/example/upgrade_server.rb
@@ -1,3 +1,5 @@
+# frozen_string_literals: true
+
 require_relative 'helper'
 require 'http_parser'
 require 'base64'
@@ -82,6 +84,15 @@ def on_message_complete
   end
 end
 
+def request_header_hash received_hash = {}
+  Hash.new do |hash, key|
+    k = key.to_s.upcase
+    k.gsub! '_', '-'
+    _, value = received_hash.find {|header_key,v| header_key.upcase == k}
+    hash[key] = value if value
+  end
+end
+
 loop do
   sock = server.accept
   puts 'New TCP connection!'
@@ -99,8 +110,11 @@ def on_message_complete
   end
 
   conn.on(:stream) do |stream|
+
     log = Logger.new(stream.id)
-    req, buffer = {}, ''
+    request_headers = {}
+    req = request_header_hash(request_headers)
+    buffer = ''
 
     stream.on(:active) { log.info 'client opened new stream' }
     stream.on(:close) do
@@ -108,7 +122,7 @@ def on_message_complete
     end
 
     stream.on(:headers) do |h|
-      req = Hash[*h.flatten]
+      request_headers.merge! Hash[*h.flatten]
       log.info "request headers: #{h}"
     end