Debugging when using a mocked endpoint

[ayushn21]

I copied the test code from the docs into a little script and also required Ruby's debug gem.

As shown below, I've placed a breakpoint just before the request is made. I then run the request in the debugger using the exact line in the script: response = client.get("/"), but the debugger hangs and there's no response.

Running without the debugger works absolutely fine. It's no big deal for my actual work but I'm just curious as to why this happens?

require 'async/http'
require 'async/http/mock'
require 'debug'

Sync do
  mock_endpoint = Async::HTTP::Mock::Endpoint.new

  server_task = Async(transient: true) do
    mock_endpoint.run do |request|
      ::Protocol::HTTP::Response[200, {}, ["Hello, World"]]
    end
  end

  endpoint = Async::HTTP::Endpoint.parse("https://www.google.com")
  mocked_endpoint = mock_endpoint.wrap(endpoint)
  client = Async::HTTP::Client.new(mocked_endpoint)

  binding.b
  response = client.get("/")
  puts response.read
end