Allow connection from other ports

[atahanuz]

I'm running pyxtermjs on port 5002 and it works fine in this link
http://localhost:5002

I'm using nginx to proxy port 8083 to port 5002, to be able to access to terminal from port 8083
http://localhost:8083

But here the connection is blocked and it shows this
ERROR (_log_error_once:720) http://localhost:8083 is not an accepted origin. (further occurrences of this error will be logged with level INFO)

I guess it is blocking connections from other ports as a security feature. Is there any way to allow this ?