Sasha Stadnyk

Issue still exists Had the same error in incognito mode and RSpec system tests ```ruby # Quick fix def show ... if session.id.present? impressionist @question, nil, unique: %i[impressionable_type impressionable_id session_hash]...

@nikhilbhatt There is still one failed test [here](https://github.com/nikhilbhatt/puma/blob/return_lowercase_response_headers/test/test_puma_server.rb#L918) could you please fix it.

@nikhilbhatt what about this one and 408 error response https://github.com/puma/puma/blob/5145708295c91314c553ce0aedbb80e2587d8ee9/lib/puma/const.rb#L128