Improvement & Bug fix for Proxyman 1.4.5.1

[NghiaTranUIT]

🐶 Brief

We found some minor things that we could improve.

👑 Criteria

• Reuse HTTPMessage when detecting if the HTTP Response is finished or not. Reduce one of HTTPParser instance
• BUG: Clear flows that don't close alive connections.

[NghiaTranUIT]

All done 🎉

By closing all alive connections after clearing the request. The memory drops down dramatically. It's good new.