Server crashes when using gzip compression

[floriandejonckheere]

Tipi's Rack adapter crashes when a request with Accept-Encoding: gzip is handled:

/usr/local/bundle/gems/tipi-0.55/lib/tipi/rack_adapter.rb:28:in `respond': undefined method `first' for #<Rack::Deflater::GzipStream:0x00007f6c78931930 @body=#<Rack::BodyProxy:0x00007f6c78932a10 @body=["Not Found\n"], @block=#<Proc:0x00007f6c78932920 /usr/local/bundle/gems/rack-3.0.8/lib/rack/common_logger.rb:45>, @closed=false>, @mtime=nil, @sync=true> (NoMethodError)

            body.first
                ^^^^^^
	from /usr/local/bundle/gems/tipi-0.55/lib/tipi/rack_adapter.rb:9:in `block in run'
	from /usr/local/bundle/gems/tipi-0.55/lib/tipi/http1_adapter.rb:52:in `handle_request'
	from /usr/local/bundle/gems/tipi-0.55/lib/tipi/http1_adapter.rb:28:in `each'
	from /usr/local/bundle/gems/tipi-0.55/lib/tipi.rb:50:in `client_loop'
	from /usr/local/bundle/gems/tipi-0.55/lib/tipi.rb:41:in `block (2 levels) in accept_loop'
/srv # bundle exec ruby tipi.rb
Starting metrics server on 0.0.0.0:9394
/usr/local/bundle/gems/tipi-0.55/lib/tipi/rack_adapter.rb:28:in `respond': undefined method `first' for #<Rack::Deflater::GzipStream:0x00007fc887ff7768 @body=#<Rack::BodyProxy:0x00007fc887ff7cb8 @body=["Not Found\n"], @block=#<Proc:0x00007fc887ff7c68 /usr/local/bundle/gems/rack-3.0.8/lib/rack/common_logger.rb:45>, @closed=false>, @mtime=nil, @sync=true> (NoMethodError)

The code I was using at the moment:

require "tipi"
require "yabeda"
require "yabeda/prometheus"

Tipi.serve(
  "0.0.0.0",
  9394,
  { reuse_addr: true, dont_linger: true },
  &Tipi::RackAdapter.run(Yabeda::Prometheus::Exporter.rack_app)
)

The request that triggers the crash:

curl -sH 'Accept-Encoding: gzip' localhost:9394

The problem seems to be that Tipi::RackAdapter receives the Rack::BodyProxy object wrapped in a Rack::Deflater::GzipStream when compression is requested.