lib/async/http/protocol/http1/response.rb in async-http-0.69.0 vs lib/async/http/protocol/http1/response.rb in async-http-0.70.0

@@ -29,10 +29,11 @@
 					# @parameter reason [String] HTTP response line reason phrase.
 					def initialize(connection, version, status, reason, headers, body)
 						@connection = connection
 						@reason = reason
 						
-						protocol = headers.delete(UPGRADE)
+						# Technically, there should never be more than one value for the upgrade header, but we'll just take the first one to avoid complexity.
+						protocol = headers.delete(UPGRADE)&.first
 						
 						super(version, status, headers, body, protocol)
 					end
 					
 					def connection