The following logs indicate that your application is not working at the configured port:
[Tue Dec 27 05:43:20.980841 2016] [proxy:error] pid 3065:tid 140050520057600Connection refused: AH00957: HTTP: attempt to connect to 127.0.0.1:8000 (127.0.0.1) failed
[Tue Dec 27 05:43:20.980853 2016] [proxy_http:error] [pid 3065:tid 140050520057600] [client 188.8.131.52:36748] AH01114: HTTP: failed to make connection to backend: 127.0.0.1
You should check whether you're able to connect to it locally or not:
If Apache was configured proprerly, you should see an error (like the page not being available). If not, could you show us how you configured your Apache server?
Also, you should check for any error message in the application logs, when executing with Forever. You could also try to stop it with Forever and execute it manually for checking the output more easily.
I hope it helped.