title: How to check if application has started inside container
body: <p>We have an integration test suite that starts containers before starting any test cases. we used to wait for port to be available before executing any tests, which indicated that application is ready to receive requests. But with version 1.7.1 ports are instantly available, before application has even started inside container.</p>
  
  <p>Is there an option to postpone docker port forwarding until port is open inside container?</p>
  
  <p>Or is there other reliable method to check if application has started inside container?</p>