When running my VCR specs against the latest em-http-request release (0.2.10), I get errors like these:

1)
NoMethodError in 'VCR::HttpStubbingAdapters::WebMock using em-http-request when #http_connections_allowed is set to true allows real http requests'
undefined method `[]' for nil:NilClass
/Users/mmarston/.rvm/gems/ruby-1.8.7-p299/gems/webmock-1.3.1/lib/webmock/http_lib_adapters/em_http_request.rb:76:in `build_request_signature'
/Users/mmarston/.rvm/gems/ruby-1.8.7-p299/gems/webmock-1.3.1/lib/webmock/http_lib_adapters/em_http_request.rb:31:in `send_request'
/Users/mmarston/.rvm/gems/ruby-1.8.7-p299/gems/em-http-request-0.2.10/lib/em-http/request.rb:59:in `setup_request'
/Users/mmarston/.rvm/gems/ruby-1.8.7-p299/gems/em-http-request-0.2.10/lib/em-http/request.rb:49:in `get'
./spec/http_stubbing_adapters/webmock_spec.rb:51:in `make_http_request'
/Users/mmarston/.rvm/gems/ruby-1.8.7-p299/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `call'
/Users/mmarston/.rvm/gems/ruby-1.8.7-p299/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'
/Users/mmarston/.rvm/gems/ruby-1.8.7-p299/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'
./spec/http_stubbing_adapters/webmock_spec.rb:49:in `make_http_request'
/Users/mmarston/code/vcr/spec/support/http_stubbing_adapter.rb:82:in `test_real_http_request'

When I run my specs against em-http-request 0.2.7, they pass. Looking at the stack trace, you can see the problem is here--you're referencing @options, but apparently it's nil.