EventSource's response has a MIME type ("text/html") that is not "text/event-stream".

[dkaukov]

Hi, after forking template and bulding it with default settings. Im getting lot of

Attempting SSE connection.
demo/:1 EventSource's response has a MIME type ("text/html") that is not "text/event-stream". Aborting the connection.

It seems like /events endpoint responds with default html:

Any pointers where to dig?