Unable to connect to JupyterHub

[Rafel Amer Ramon]

Hi,

I have installed Jupyter and JupyterHub in Ubuntu and configured Apache

as a proxy. But when I try to connect to http://localhost, I get the following error

in the web browser:

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request

Reason: Error reading from remote server

I'm sure that JupyterHub is running. If I run it in degug mode

~# jupyterhub -f /etc/jupyterhub/jupyterhub_config.py --debug &>> jupyterhub.log

~# tail -f jupyter.log

tail -f jupyterhub.log
12:59:08.662 [ConfigProxy] info: 200 GET /api/routes
[I 2020-03-29 12:59:08.664 JupyterHub proxy:320] Checking routes
[I 2020-03-29 12:59:08.664 JupyterHub proxy:400] Adding default route for Hub: / => http://127.0.0.1:8081
[D 2020-03-29 12:59:08.665 JupyterHub proxy:766] Proxy: Fetching POST http://127.0.0.1:8001/api/routes/
12:59:08.666 [ConfigProxy] info: 200 GET /api/routes
12:59:08.667 [ConfigProxy] info: Adding route / -> http://127.0.0.1:8081
12:59:08.667 [ConfigProxy] info: Route added / -> http://127.0.0.1:8081
[I 2020-03-29 12:59:08.668 JupyterHub app:2631] JupyterHub is now running at http://127.0.0.1:8000
[D 2020-03-29 12:59:08.669 JupyterHub app:2233] It took 0.617 seconds for the Hub to start
12:59:08.669 [ConfigProxy] info: 201 POST /api/routes/

Then I try to connect to the server

~$ lynx http://localhost

ang get the same error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request

 Reason: Error reading from remote server

and nothing is shown in the jupyterhub.log file. It seems that apache can't connect to jupyterhub.

Any help would be appreciated

Rafel Amer