rstrip on Ruby 3 does not accept an argument.

Author: ioquatix

lib/protocol/http1/connection.rb

@@ -502,7 +502,7 @@ def read_headers
 					if match = line.match(HEADER)
 						# The RFCs require stripping of optional whitespace, but only at the end of the field value:
 						if value = match[2]
-							value.rstrip!(" \t")
+							value.rstrip!
 						else
 							value = ""
 						end