Expected behavior:
The "Che" project will be successfully cloned
Observed behavior:
Cloning of the "Che" project is failed
Attachment:


OS and version:
Che 6.8.0 ; Chrome 67.0 ; Fedora 25
As far as I see, Import project request failed due to 504 Error after 30 seconds

I've checked and as far as I understand this request imports project synchronously.
I think the request is failed after 30 seconds because it may be a default value for request timeout on OCP haproxy router. https://docs.openshift.com/container-platform/3.5/install_config/configuring_routing.html
A possible solution is to do import method asynchronous.
As an alternative solution - increase timeout by adding a custom annotation to each workspace timeout, but I prefer the first way.
I can confirm your idea @sleshchenko, we will switch import process to the JSON_RPC backend
Most helpful comment
As far as I see, Import project request failed due to 504 Error after 30 seconds

I've checked and as far as I understand this request imports project synchronously.
I think the request is failed after 30 seconds because it may be a default value for request timeout on OCP haproxy router. https://docs.openshift.com/container-platform/3.5/install_config/configuring_routing.html
A possible solution is to do import method asynchronous.
As an alternative solution - increase timeout by adding a custom annotation to each workspace timeout, but I prefer the first way.