Plack::Middleware::Chunked

  # Mostly from server implementations
  $app = Plack::Middleware::Chunked->wrap($app);

Plack::Middleware::Chunked is a middleware, or rather a library for PSGI server to automatically add chunked encoding to the response body when Content-Length is not set in the response header.

Tatsuhiko Miyagawa

Rack::Chunked