Infinite loop with httpx 1.4.0+, webmock and vcr

[jaynetics]

When using webmock and vcr, httpx v1.4.0+ hangs or goes into an infinite loop if there is no matching cassette.

Maybe VCR::Errors::UnhandledHTTPRequestError is swallowed now?

The problem does not happen with earlier versions of httpx.

This is the control flow that loops / repeats indefinitely:

/gems/httpx-1.4.1/lib/httpx/selector.rb:169
/gems/httpx-1.4.1/lib/httpx/selector.rb:173
/gems/httpx-1.4.1/lib/httpx/selector.rb:38
/gems/httpx-1.4.1/lib/httpx/timers.rb:41
/gems/httpx-1.4.1/lib/httpx/timers.rb:42
/gems/httpx-1.4.1/lib/httpx/session.rb:228
/gems/httpx-1.4.1/lib/httpx/session.rb:320
/gems/httpx-1.4.1/lib/httpx/selector.rb:29
/gems/httpx-1.4.1/lib/httpx/selector.rb:30
/gems/httpx-1.4.1/lib/httpx/selector.rb:190
/gems/httpx-1.4.1/lib/httpx/timers.rb:33
/gems/httpx-1.4.1/lib/httpx/connection.rb:311
/gems/httpx-1.4.1/lib/httpx/connection.rb:313
/gems/httpx-1.4.1/lib/httpx/selector.rb:31
/gems/httpx-1.4.1/lib/httpx/selector.rb:37
/gems/httpx-1.4.1/lib/httpx/selector.rb:115
/gems/httpx-1.4.1/lib/httpx/selector.rb:117
/gems/httpx-1.4.1/lib/httpx/selector.rb:163
/gems/httpx-1.4.1/lib/httpx/selector.rb:165
/gems/httpx-1.4.1/lib/httpx/selector.rb:167
/gems/httpx-1.4.1/lib/httpx/adapters/webmock.rb:102

Here is a minimal reproduction (warning, this may block your terminal):

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'httpx', '~> 1.4'
  gem 'webmock', '~> 3.25'
  gem 'vcr', '~> 6.3'
  gem 'tracer', '~> 0.2.3'
end

require 'httpx/adapters/webmock'

VCR.configure do |config|
  config.hook_into :webmock
  config.allow_http_connections_when_no_cassette = false
end

LineTracer.new.start
HTTPX.get('http://example.com')