Using ddtrace 0.38.0, we are seeing errors with our http.rb responses when enabling the tracer.

Tested with http.rb 4.3.0 and 4.4.1

Configuration:

Datadog.configure do |c|
  c.use :httprb,
        analytics_enabled: true,
        service_name: "http-rb-#{ENV['HEROKU_APP_NAME']}"
end

We are seeing HTTP::StateError: body is being streamed errors on failure responses such as 4xx. When inspecting the response returned by http.rb, we are seeing:

#<HTTP::Response::Body:3fc14efc16c0 @streaming=true>

Disabling the httprb trace in the configuration returns the following response:

#<HTTP::Response::Body:3ff78f899c90 @streaming=false>

This appears to only be happening on failure level status codes and is preventing us from properly parsing response bodies.