That post is outdated (it's not for Chanels 2), you nginx.conf is wrong, ws isn't location, it's protocol so you web sockets connections are forwarded to unix://myproject/experiment_platform.sock; and this triggers your error
You just need forward all connections to daphne (except /static) -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/08278657-b0c7-4bf7-8d08-6bb70ce24f26%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.

