lib/protocol/http/headers.rb in protocol-http-0.24.5 vs lib/protocol/http/headers.rb in protocol-http-0.24.6

@@ -239,11 +239,16 @@
 				
 				# Custom headers:
 				'set-cookie' => Header::SetCookie,
 				'cookie' => Header::Cookie,
 				
+				# Date headers:
+				# These headers include a comma as part of the formatting so they can't be concatenated.
 				'date' => Header::Date,
 				'expires' => Header::Date,
+				'last-modified' => Header::Date,
+				'if-modified-since' => Header::Date,
+				'if-unmodified-since' => Header::Date,
 			}.tap{|hash| hash.default = Split}
 			
 			# Delete all headers with the given key, and return the merged value.
 			def delete(key)
 				deleted, @fields = @fields.partition do |field|