Socket.io keeps polling to establish connecting

Question

I'm trying to setup a messaging application working with Socket.io.

Currently we're facing an issue with setting up our application with a reverse proxy in the middle. When we run our application locally then we've got no problem but when putting the reverse proxy in between it keeps on socket.io keeps on polling. So it's constantly polling and no data is flowing through the long-polling connection.

Has anyone faced this before? What type of configurations have we missed?

Edit 1:

This is a screenshot from the socket io client logger

This is a screenshot from the network tab where it keeps polling:

Edit 2:

We use socket.io in polling transport mode only. So we don't try to setup a real websocket connection.

Answer 1

It turned out it had to do with caching of the socket.io requests in Akamai. In the routing rules an explicit no cache behaviour needed to be declared.